Xiaomi 17 Ultra VS Vivo X300 Ultra
▸ WHICH ONE HOLDS UP BETTERBoth land in the same place on our verdict scale, with no clear scorecard edge either way. The difference is in the specifics — read each PixProof's full evidence below for what actually separates them for your use case.
Verdict🟡 QUESTION IT🟡 QUESTION IT
The RealityDxOMark's independent lab testing gave the 17 Ultra a combined camera score of 166 (170 photo / 157 video) -- a strong result that beats the Honor Magic 8 Pro, but one that lands the phone 6th overall, behind the Huawei Pura 80 Ultra, the Vivo X300 Pro, and a tie between the Oppo Find X8 Ultra and Apple iPhone 17 Pro, according to DxOMark's own ranking as covered by Gizmochina and Phandroid. Android Central's hands-on review was more enthusiastic, calling the imaging system an upgrade that 'makes the Galaxy S26 Ultra obsolete,' and multiple outlets including PetaPixel, CineD and LeicaRumors independently confirmed the headline claim: this is the first Leica APO-certified lens on any smartphone.Reviewers broadly confirmed the zoom system: PetaPixel called Vivo's color science 'arguably the best in the industry' overall and found the telephoto genuinely capable of a 'just crazy' 1,600mm-equivalent hybrid zoom handheld, while GSMArena's lab tests praised the native 85mm telephoto's 'high contrast and vivid colors.' But Notebookcheck's independent color-accuracy testing of the flagship new 12-channel color sensor found the opposite of 'professional accuracy' at launch, measuring 'very high measured deviations and pronounced brightening of the colors for a high-end smartphone' -- a flaw serious enough that Notebookcheck flagged it as one of the phone's few real weaknesses despite an otherwise glowing review. Vivo subsequently shipped a software update that Notebookcheck confirmed improved the color reproduction, meaning the initial marketing claim didn't match the shipping product until a patch arrived. SHORT ANSWERXiaomi 17 Ultra: Mostly true but oversold. The Xiaomi 17 Ultra genuinely is the first smartphone with a Leica APO-certified telephoto lens, and its camera is excellent, but independent DxOMark testing ranks it 6th overall, behind rivals like the Vivo X300 Pro, not the outright best camera phone the marketing implies.
Vivo X300 Ultra: Partly true. Vivo's zoom claims for the X300 Ultra check out and reviewers call it among the best zoom systems on a phone, but the flagship 'professional-grade' color accuracy claim didn't hold up in independent lab testing at launch, with Notebookcheck measuring significant color deviation that Vivo only corrected with a later software update.