I don't have an iPhone 4 to compare it to, but my 4S has the same desktop picture as my iPad 2, and the photo is much warmer and yellower on the iPhone than the iPad. I guess I could complain about it, but honestly, I would rather have it be warmer than have a patch of dead pixels or bleeding backlight or dust specks or any of the other numerous annoyances that can pop up as variations in displays. It's always a crapshoot as to what you will get, and if there is no dust or dead pixels, I will just be happy that I got a nice display, even if it is on the warm side.