I have yet to go to the Apple store and check out the new iMac so I haven't seen how the new screen looks. I stumbled across this photo on a photography forum and thought I'd share for anybody who wants to see the difference in screens. I'd say the new screen looks pretty good.
http://www.flickr.com/photos/alabang/8502833316/lightbox/
http://www.flickr.com/photos/alabang/8502833316/lightbox/