Snapdragon 810 performance slowdowns, and a battery life hit.We can attest to that claim, as when we took screenshots from the Z5 Premium at the IFA expo, those were later shown to be Full HD images, not 4K ones. In a nutshell, it seems that you can view 4K media like pictures and videos in Sony's native gallery and player in its full glory, perhaps even set 4K wallpapers, but when it comes to the Xperia UI, it hasn't been redrawn by Sony, or upscaled further than 1080p. Some argue that this actually makes sense, as rendering a 4K interface around would place unnecessary strain on the graphics subsystem, leading to
These can be easily avoided by enabling 4K only where it matters most - in the camera/gallery, and during video playback and upscaling. What do you think, will you be satisfied with this eventual Sony approach to the world's first phone with a 4K display?