But when it comes to movies and things, how well is this screen.
Display quality is excellent, high contrasts, deep blacks, no stuck pixels, almost no light bleeding, FAR better than the Samsung screens I saw the last months (e. g. Note 10.1 2014).
BUT (nothing without a big but): Tearing problems while scrolling (gets corrected with firmware 2.55), slightly worse display quality of text elements if holding the Z2 in portrait orientation.
The lower resolution compared with other tablets of today is no dealbreaker; you WILL notice that gear like the Note 10.1 2014 displays text a tiny bit better - you'll notice that if you've got the chance to do a side-by-side comparison. Seems to be a bad antialiasing algorithm utilized with the Z2.
Regarding videos: Movies look slightly better on the Z2, thanks to the better contrast ratio, the deeper black and the "X-Reality" feature. Yes, it really works. Not with every video, but in most cases this feature performs just fine.