My iPhone 4 on the left, 5 on the right.
Was extremely yellower tinted when I first got it. Now it's almost identical. Note the colors, they are much more intense on the 5 than they are on the 4.
The brightness is even MORE bright than the 4.
It does go away.
I think the right one looks washed, lacks contrast and too yellowish white...
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Interestingly, my 4s is yellower than my 5.
[url=http://farm9.staticflickr.com/8185/8136043504_6060223a1f.jpg]Image[/url]
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Check the brightness level on your ip4 and set it to 50%