s21 screen issues on both phones. on my second one; looks less sharp

noticed my second s21 isn't quite as sharp looking as the store models. 1st one had a very very slight green tint. maybe I'm just being picky but is there something going on with these screens or am I just having bad luck? I should also mention that both have been dropped on concrete while in an otterbox symmetry case and tempered glass for the screen....idk if that would've done it? never had this issue before with Samsung phones. one of the corners is slightly dinged up on my current phone so idk if I just have shitty protection. can't find anything about this anywhere. the recent update fixed the brightness issue though although sometimes I think it dims slightly. anyone have any insight on this?