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The Z4 is said to have a bigger screen than the Z3, though accounts vary as to its actual size.

One source told PhoneArena it will sport a 5.2-inch, 1080p display. However, a previous report claimed it will be a 5.4-inch QHD screen.

Both of these are improvements on the Z3's 5.15-inch display.

Reading the tea leaves, we would wager the 5.4-inch, QHD screen is more likely.

Screens are getting bigger and sharper, and ever since the LG G3 launched last year, QHD (aka 2K) is quickly becoming standard for flagships.

The LG G4 is said to boast a 3K screen. With standards evolving so quickly, it's unlikely Sony would stick with bog-standard 1080p.