Hands on with Sony’s new Xperia Z5 phones, including that ludicrous 4K display - ArsTechnica

Forget QuadHD displays: the new hotness is 4K. At IFA 2015, Sony took the wraps off its new Z5, Z5 Compact, and Z5 Premium phones, with the flagship Z5 Premium sporting a 5.5-inch 4K (3840×2160) display, which works out to a ridiculous 806 PPI. The jury's still out on whether you actually need a 4K display in a phone, but—in Sony's demos, at least—it looked ridiculously good, with vibrant colours and deep blacks.

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