When Sony announced the Xperia Z5 earlier this month, it claimed that its latest flagship was not only the world’s first phone to sport a 4K display, but also offered two days of use on a single charge. In a statement to PhoneArena, the company revealed the secret behind those magic numbers. The Z5 renders most content at 1080p and only enables 4K when it’s actually useful: Xperia Z5 Premium features a 4K display with a resolution of 3840×2160 pixels based on SID Standard and enables all video and image content to be enjoyed in 4K resolution. All other content is…
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