Sorry to be a bit late in the convo but back to OP 1st question, yes 120hz screen does improve watching films and tv progs as 120hz is a multiple of 24 (fps), where as 60hz isnt so 60hz monitors use a ratio of 3:2 where your video output sends 3 signals every second to your display but it drops the 3rd to maintain continuity and avoid things like tearing when watching movies.