I don't know.. how about a full HD 1080p screen?
well here is some info for you
306 ppi vs 441 ppi 135 more ppi
1280x720 hd vs 1920x1080 full hd
gs4 is also brighter,better colors and better battery life over the gs3 screen and it also get gorilla glass 3 and a jump from 4.8 to 5.0 inches
You can also change between color profiles for the display to make it duller (what iPhone users call more "accurate").
Wow, that's really very big improvements over the S III! Thanks for all the info!