I think it all depends of people's preferences. The high ppi gives iPhone 4 such amazing detail and sharpness. Without seeing any pixels, it really is like what Apple says and you are looking at something printed from a page. It clearly is evident when you look at small pictures in this forum's picture gallery section. I could see the picture in such a small state and be like wow because how sharp it looked even at that size before even zooming at it.After going to the Att store numerous times and comparing phones side by side I have come to the following conclusion that the only 2 screens I will accept on a phone is:
1) iPhone 4 high resolution IPS display
and
2) SuperAMOLED+
I've compared the two and the iPhone's is better resolution and better sunlight readability (than say the Infuse 4g) but if I had to pick a different phone it would be one with SuperAMOLED+
And then I remember looking at the Samsung Focus about six months ago and was really impressed by the contrast which made colors standout even if they were not quite as realistic. I remember a guy holding a Samsung Captivate while I was in line and I can see all the icons in bright colors while I was standing maybe 8-10 feet away from him. It really boils down to people's taste. Sharpness (pixel density) vs Contrast (true blacks).