You can't go in and use the iPhone 4 as a reference point and demand a new 5. Apple doesn't see the warm tint as a defect. Now if there are patches of yellow and dead pixels that is a different story but you can't just say the screen tint is warmer than the 4 and get a new one.
Go to an Apple store and compare it to those floor models, that picture would be more useful.
I did this about 2 hours ago and my 5 is yellow compared to the iPhone 5 models they have on the floor at the Apple Store here in Nashville. I'm starting to feel I'm in a court room. I have a Genius Bar appointment tomorrow at which time I will bring all my phones, my iPad and take a picture with the whole Apple iPhone family and let y'all tell me I need to do something else! I'm sure one of the Apple reps will ask me what I'm doing and I will just refer them to this thread! The Apple rep I talked to today said he had never heard of this issue. He also said the resolution of my iPhone 5 was much better than my iPhone 4.