Nothing Phone (4a) vs Xiaomi 15 Ultra

Nothing Phone (4a)

A genuine highlight for the price — a big 6.78-inch 120Hz AMOLED that's bright, sharp and HDR-capable, beating similarly priced rivals.

• 6.78-inch AMOLED, 120Hz, 2160Hz PWM, HDR10+, 800 nits typical / 1,600 nits HBM / 4,500 nits peak at 1224x2720 (440ppi).
• The 6.78-inch display is 23% brighter than the 3a, reaching 1,600 nits outdoors with a 4,500-nit HDR peak.
• Brightness goes up to 4,500 nits peak, remaining easily readable outdoors — the display is very strong for this price range and one of the standout features.
• In the real world it hits around 700 nits peak SDR and ~1,550–1,600 nits in HDR, with 460ppi and dynamic 120Hz.

Xiaomi 15 Ultra

A 6.73-inch 2K AMOLED with curved edges, 120Hz, a 3,200-nit peak and 1,920Hz PWM dimming. Reviewers call it gorgeous and one of the brightest screens around, with the lone caveat that real-world auto-brightness measured lower than the headline number.

• The 6.73-inch display is gorgeous, super sharp and crazy bright — fantastic indoors and out, second only to the Galaxy S25 Ultra in direct sunlight thanks to Samsung's anti-glare tech.
• On paper it has the brightest screen at 3,200 nits (vs 2,600 on the Samsung, 2,000 on the iPhone) and supports 1,920Hz PWM dimming so it flickers much less than its rivals.
• Lab testing clocked ~3,175 nits at 20% APL — basically stare-at-the-sun-and-still-see-your-screen territory.
• The maximum achievable auto-brightness is only around 1,150 nits, which is rather disappointing for this level of phone, though still usable under sunlight.
• It has 3,200 nits peak brightness across a 25% area rather than the usual 1% window — a genuinely usable peak.
• Watching YouTube, Netflix or gaming, the display still feels flagship-level 10 months in.

Nothing Phone (4a)

A standout 3.5x periscope telephoto at this price and a solid main camera, undercut by an under-optimised zoom and a basic ultrawide.

• A triple setup — 50MP main, a 50MP periscope telephoto and an 8MP ultrawide — undoubtedly one of the best experiences at this level.
• The telephoto has been tweaked to a much better 3.5x (80mm) zoom factor.
• A telephoto with optical zoom at this price is great, but this is the worst optimisation I've seen on a 3.5x camera — expect disappointment if you buy for the zoom.
• The 3.5x optical-zoom telephoto is one of the biggest highlights, adding much more flexibility than most competitors in this price range, and the cameras are surprisingly capable.
• Each camera here feels better than what you'd get on Samsung at the price, and the main is solid with nice detail.

Xiaomi 15 Ultra

The whole point of the phone: a Leica Summicron quad system — a 1-inch-type 50MP main, a 50MP 3x telephoto, a 200MP 4.3x periscope and a 50MP ultrawide. Reviewers overwhelmingly rate it the best phone camera of its generation, with the only soft spots being the ultrawide and a missing variable aperture.

• A Leica Summicron system: a 1-inch-type 50MP main (23mm), a 50MP 3x telephoto, a 200MP periscope (4.3x optical, ~100mm) and a 50MP ultrawide — the 1-inch main is an unexpected differentiator no one else uses in a globally available model.
• As far as phones personally used, this is the best camera experience bar none — if cameras are your top priority you cannot get better than the 15 Ultra.
• Main camera-wise the Xiaomi is the best overall, especially for daytime shots and depth of field; at 3x it captures the most detail and at 5x it has the least noise versus the S25 Ultra and iPhone.
• Xiaomi did get the best camera hardware, but the leather-camera look is mostly aesthetic — what makes a real camera good is a far bigger lens, and this is still a small smartphone sensor.
• The only slightly underwhelming lens is the ultrawide — still better than most competitors, but a noticeable dip versus the other three excellent rear lenses, especially in video.

Nothing Phone (4a)

A capable mid-range chip that handles everyday use and casual gaming well — not a powerhouse, but appropriate for the price.

• Gaming is absolutely possible on this device, with solid everyday performance for the class.
• There's no shortage of substantial hardware upgrades over the 3a, even if the design doesn't stand out as much as the Pro.
• After 24 hours the home screen is extremely customisable and feels massively more functional than iOS, with no responsiveness complaints.
• Gesture-based navigation is fully supported and the overall experience is good thanks to Nothing's optimisations.

Xiaomi 15 Ultra

Snapdragon 8 Elite with up to 16GB RAM and UFS 4.1 — flagship-grade and still excellent a year on. Real-world gaming holds ~57–60fps with acceptable power draw, though heavy synthetic stress tests show meaningful throttling.

• Runs Qualcomm's Snapdragon 8 Elite with up to 16GB RAM and 1TB UFS 4.1; 10 months on it's still an extremely well-balanced phone that feels like a true flagship.
• In ~50 minutes of gaming it held a stable ~57–60fps with 4–8W draw — acceptable for the 8 Elite — where some rivals throttle hard and drop to 30fps after 30 minutes.
• After 30 minutes of real gaming with apps closing/reopening the CPU sat around 47°C with no overheating — heat only appears in synthetic 3DMark/throttle benchmarks, not realistic use.
• In a 3DMark stability run it scored ~70–76% stability (lowest loop ~4,335–4,542), holding 20–43fps.
• Under a punishing 60-minute 100-thread CPU throttle test it dropped roughly 40–50% in sustained performance, recovering only slightly better than the S25 Ultra.
• Out of the box it gives a very iPhone-like feel and you have to dig in and change things, but performance itself is amazing alongside the camera, battery and display.

Nothing Phone (4a)

A ~5,080mAh cell with 50W wired charging — reviewers call endurance strong, but a notable group of owners report disappointing screen-on time.

• The Nothing Phone (4a) features a ~5,080mAh cell which delivers very strong endurance in everyday use.
• The battery grew slightly — about 80mAh in most markets but a more meaningful 400mAh in India — with a 50W PD unit recommended on the box.
• Several owners report only 4–6.5 hours of screen-on time with moderate use — worse than other phones with similar ~5,000mAh batteries.
• Battery life on this phone is excellent in everyday use.

Xiaomi 15 Ultra

The global model's ~5,410mAh cell (vs 6,000mAh in China) is the phone's weakest area — many reviewers end the day under 30%, with a notable idle drain — though 90W wired charging fully refills it in roughly an hour and Chinese-variant users report much better longevity.

• The global variant has a smaller 5,410mAh cell vs the 6,000mAh China variant, and most days the phone is around or under 30% by the end of the day — it could have done with a bigger battery.
• With always-on display, 120Hz and intensive camera use it consistently achieved over 15 hours of usage on a single charge in real-world testing.
• On the global/Indian 5,410mAh battery, the in-box 90W charger refills it roughly: 18% in 5 min, 67% in 30 min, 90% in 45 min, and a full charge in about an hour.
• On the Chinese 6,000mAh variant with a power-efficient chip, the battery was still at 78% after not charging for three nights.
• There's a real idle-drain issue — 20 minutes of light morning use can drop 5–6%, and it persists even with extra-dim settings enabled.
• After 6 months of careful charging, battery health held at 97% with 191 cycles — degradation isn't a concern with sensible habits.

Nothing Phone (4a)

Near-stock Nothing OS is repeatedly singled out as one of the best, cleanest and most customisable Android experiences at any price.

• The UI is pretty much stock Android, which is the best Android experience — Nothing and Pixel offer the best Android experience.
• While hard to compare to Samsung's far more customisable One UI, Nothing's OS is one of the best ways to experience Android.
• The in-house gallery, voice recorder and weather apps have wonderful design consistency, with everything else left as Google's clean defaults.
• The home screen is extremely customisable with built-in and user-made widgets — fresher, clearer and bolder than iOS.

Xiaomi 15 Ultra

HyperOS (now on the Android 16 / HyperOS 3 track) is the phone's most criticized aspect: it heavily mimics iOS, ships with quirks you must tweak, and carries small persistent bugs — though it adds genuinely useful touches like a Super Island and AI features, and Xiaomi has improved it via updates.

• Out of the box it gives a really iPhone-like feel and you have to go in and change things before it behaves how you want.
• Long-standing requests are still ignored — no combined notification/control center, removed options like front-camera switching while recording video, and the dropped variable aperture.
• HyperOS adds a useful Super Island (tap to expand or switch to a floating window) and direct drag-and-drop into chats, with OS 3 refining the control center.
• Xiaomi's animations are nearly iOS-level and arguably better than stock Android, but the software is still seen as subpar for the Western market.
• Xiaomi now offers a longer software-update commitment (reported up to 6 years) — a meaningful improvement for long-term buyers.
• HyperOS contained a lot of small bugs and one user's battery health dropped to 70% in two years of light use before they switched to Samsung.

Nothing Phone (4a)

Aggressively priced below the Pixel 10a with a more distinctive design and a real telephoto — the standout budget pick for buyers who want personality.

• It's a good chunk of change cheaper than the $500 Pixel 10a.
• It fits the perfect budget for buyers who can't afford the ~$1,000 needed for an entry-level iPhone 17, with good hardware and excellent battery.
• A very strong mid-range smartphone that stands out with unique design, great display, solid performance and surprisingly capable cameras — definitely worth a closer look.
• Nothing stands out among the crowd with a brand identity strong enough to turn consumers into fans.

Xiaomi 15 Ultra

Roughly $893 in China and ~$1,220+ imported globally, it undercuts the Galaxy S25 Ultra and iPhone while comfortably winning the camera comparison. The catch is it's an import with no official US presence — a phone you 'probably can't buy' but the camera benchmark to beat.

• It launched at 6,499 yuan (around $893) in China; Xiaomi's Ultra line has always been more camera-centric than Samsung or Apple's top models.
• It combines top-tier hardware, excellent cameras and strong performance at a more competitive price point than its rivals.
• The Xiaomi wins the camera part comfortably, but the Galaxy S25 Ultra may be the better all-rounder — a 'maybe' that hangs on whether the S Pen matters to you.
• It's 'an excellent phone you probably can't buy' — one of the best devices that simply isn't officially sold in the US.
• The camera is absolutely phenomenal, but everything else about it sort of falls short for some owners coming from a Pixel.
• If you care about US carrier support or ecosystem features like iMessage/FaceTime, or want something lighter and simpler, you may still be happier with an iPhone or Galaxy.