13" retina MBP has yellow tint issue. Check demo 13" retina MBP at apple store and compare the screen with Air screen. Air screens has very accurate color balance and all the 13" rMBP has yellow tint issue. At least at my apple store. I bought a 13" rMBP and yellow tint is really bothering me. I have MBA also and i compared the two screens. Yellow tint is so obvious on rMBP screen specially if you watch youtube videos or movies.
No. This is a lie. Not all of them have a yellow tint, perhaps the ones that you saw but my ones are perfect colour representation.