One year ago as Iphone 3gs introduced, i say to my brother (who is also an Iphone user): Look at the Screen Resolution it is lower then Nokia 5800 and other Symbian Devices. His answer was: Don't count to the spec sheets, IPhone 3gs display is far better then anything else.
Now Iphone 4 is released and you say: Look at the screen resolution. :-)))))
PS: Sorry of my english.