Today we’re having a look at the Sony Xperia Z5 Premium with 4K display, deciding whether or not it makes sense to go this far with sharpness on a mobile display. This device has a 5.5-inch display panel, meaning you’ll have 806 pixels per inch – far more than is discernible by the human eye. We’ll have to try this device out for an extended period of time before we decide whether or not it’ll be worth the “Premium” price it’ll cost.
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https://www.slashgear.com/sony-xperia-z5-premium-hands-on-with-4k-display-02400609/