Sony might have struck gold when it announced the Xperia Z5 Premium, the world’s first ever 4K smartphone, which also makes it the world’s smallest 4K display, However, that adage about not judging books by covers might very well apply to screen resolutions as well. While the manufacturing feat of fitting a 4K display inside a 5.5 screen space is definitely laudable, its benefits apparently aren’t as much. Sony has just confirmed that the smartphone only uses that 4K resolution when viewing images and videos.
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https://www.slashgear.com/sony-xperia-z5-premium-uses-4k-only-in-media-1080p-elsewhere-15404842/