Love the display on my SGS2X, even at very low brightness it's really quite vivid and crisp. One thing I did notice is that the screen seems to attract/collect more crap than the iPhone screens for some reason. I'm talking dust, fingerprints, fur, etc. It's as if the iPhone somehow repels everything. If I had to think of anything to be improved upon on the Samsung, it would be that. Otherwise the display is stunning.
That nice display does come at a cost though, open up the program that shows what is taking up the most battery, and the display is always at least 50%! Android OS seems to come in second place at 20%+. I suspect this is pretty standard for any phone though.