I give up! This thing is going back to the store for the last time tomorrow! I purchased the top of the line 15 inch rMBP about 2 weeks ago. Since then I have exchanged it 4 times, this is my 5th rMBP. Here is my story:
1) The first one I got had perfect color, no image retention, and no dead pixels. I did a full check on it, and did not see any problems on the first day. After a week I noticed somewhat annoying backlight bleed in the lower left corner. I work a lot in terminal and like the black backgrounds in full screen mode, so it started to annoy me. Since apple had an entire year to fix screen problems, I figured that ****, let me try for a swap, I am sure this is just a fluke. I was wrong! My first screen was an LG.
2) The second one had perfect (**** near) backlight bleed level, but horrible backplate discoloration. As you would swipe from desktop to desktop, you could see shadows on the backplate. The screen was also very dim. This one was a Samsung screen.
3) The third one was another Samsung with 1/4 of the screen VERY yellow. I wish I took a picture, but you could see the yellow on the boot screen, didn't even have to go through the setup to return that one. I think I could have lived with an even yellow screen, but this was rather pink on the right, and VERY yellow on the bottom left 1/4.
4) Not sure LG or Samsung, but pick throughout. Like, really, really, really pink. Even if you balance it to 8000k color temp, it would look blue with, you guessed it, lot's of pick. The pick is coming from the lights, BTW, not the actual screen. Because, if you turn the laptop, you will see that the apple logo on the back is also pink. (compare it with regular MBP for reference).
5) My final one! LG screen, even color temp, pink, but acceptable level of pink which I can balance out for the most part. BUT, the backlight is uneven. The right side is noticeably dimmer on the right when compared to the left. I even took pictures and measured light intensity. Oh, and to boot, lots of beautiful backlight bleed from all over the place...
So, in the end, this one is joining is brothers in the rMBP scrap pile. I kind of feel sad because I really did love my first one, but that backlight bleed was bugging the **** out of me. For the time being I am sticking with my old 2010 MBP or getting a 2012 rMBP from CL for cheep. I wouldn't feel so picky about a $1,400 used laptop, but I think I have the right to expect something at least 90% close to perfect from a $2,599 brand new laptop.
For reference, my first rMBP had a case chip, cricking bottom case, and misaligned screen lid. I was fine with all that. I do not expect unreasonable level of perfection, I just want a ******* screen that shows reasonably even and white balanced picture. If any one at apple is reading this, please, take note, because this is how you start losing customers! You just lost one, and judging by the length of this thread, many, many, others.