If you catch the reflection of a light (like a lamp, overhead light) in the black glossy outer edge of your rMBPs does it kinda look oily, like the rainbows you can see in puddles on the side of the road?
I'm assuming it is part of the antiglare they implemented, because I never see it on the actual screen. This "oil" layer looks to be pink and green.
The reason I'm brining this up is that I just checked my rMBP and at -2 max brightness in the pitch black and it was perfect. However on max brightness the left looked greenish, and the right looked pinkish. When I moved my head, knelt down, or adjusted my viewing angle the screen was the entire hued the color in regards to which side I was viewing it from.
So my conclusion is that the rMBP isn't meant to be on max brightness in the dark, because it really doesn't need to be.