I was at the local Apple Store today which of course was amazingly busy, yet they still have a slew of phones (everything except white 16GB AT&T). Anyway I just wanted to compare screens.
Man I wish I could've brought in my good camera to take some pics. The screens on the floor model 4S phones had color temperatures all over the map. Some were really warm (yellowish), some were amazingly cool (blueish). In the four or five I looked at no two looked even close to the same.
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Yes the one on the right is my 32GB black IP4. The left is my 64GB black IP4S.