I just hopped over to this discussion from the one about display burn-in, or more correctly image retention/persistence: https://discussions.apple.com/thread/4034848?start=3090&tstart=0
These rMBPs really aren't living up to their expectations in many ways it appears.
For the record, I have a Samsung screen now (2nd order) - 1st had LG screen and awful image retention. You can find out your screen manufacturer using this command in terminal:
ioreg -lw0 | grep \"EDID\" | sed "/[^<]*</s///" | xxd -p -r | strings -6
On the line after 'Color LCD' you get an output which starts with either LP... = LG screen (and probably image retention!) or LSN... = Samsung
Would be interested to see if the problem in this thread happens with both screen manufacturers? I have the problem on this current Samsung, but never tested / noticed anything with the LG since it went back pretty quick.
Getting mildly peeved with Apple to be honest. I'm not even 100% happy with the Samsung I've got now - yes no image persistence, but the machine came with a slight mark near the trackpad, the keys don't feel as good as the previous one I had, plus this weird graphics problem in safari.
GRRRR... this is not why I switched from pc to Apple and paid over £2000 in the UK!