We don't need smartphones with 4K displays yet. Here are a bunch of reasons
If rumors are to be believed, Sony might be on the way of becoming the first smartphone manufacturer to come up with a handset (the Xperia Z5 Premium) that will rock a, wait for it... 4K display. With the rumored size of the display being 5.5 inches, the upcoming Xperia might amaze us with a mind-boggling and pioneering pixel density of 805ppi.
This will put Sony in a field that hardly any other manufacturer has ventured into before. Currently, Samsung is the maker behind some of the phones with the sharpest displays, namely the Galaxy S6, S6 edge, S6 Active, and S5 LTE-A, ...