Well, I'm back to this thread.
I have a 2.7 GHz/16 GB/256 GB BTO (Week 35) I ordered at the end of August.
It had an LG-manufactured screen (SJA1) that had amazing color depth and neutral whites. Identical photos displayed on my Mid 2010 iMac and the MacBook Pro's screen were much more vivid on the laptop.
However, it developed severe IR by December, at which point after much fuss at the "genius" bar I had the screen replaced (#661-7171), and got a Samsung-made screen.
That screen had multiple noticeable uniformity issues, a faded yellow spot, and a dirty brown-yellow bottom left corner. The colors also popped out much less (most likely the abysmal black level causing this) and this time were more washed out compared to my 27" iMac's LG screen.
I just got the display replaced AGAIN three days ago in the hope of receiving a higher quality one. I did; it was much more uniform, only one barely noticeable yellow spot, and a dirty brown area in the corner so faint it doesn't really matter. However, the colors were STILL the same (i.e. washed out).
I then went to the floor model, and identified the screen. Interestingly, it was a SAMSUNG, which in December had been an LG.
Anyway, I compared the colors on my replacement display and the floor model's, and the store's laptop had noticeably better color reproduction and a slightly better black level (it was hard to tell with the glare).
I showed a store employee, and while he acknowledged the difference, he professed that his preference was my screen, and then further told me there's glue in the laminate which will wear away (not true, didn't happen with the first screen replacement). While I plan to calibrate, what I'm worried is that this screen won't calibrate as well as an LG or a higher-quality Samsung like the one in the store.
What I really want is an LG (SJA2), because there aren't any reports stating it has IR. I'm convinced no one with that panel will develop IR; LG wouldn't revise the panel number otherwise. It's the best combination of the SJA1 LG and the Samsung (best color and uniformity with no IR).
However, there's no way to get a replacement LG SJA2, which bugs me. The only way to obtain the LG revision is purchasing a 2013 rMBP, and obviously Apple will not refund my laptop so I can get a 2013 model.
(There has been one person with an SJA2 in this thread who claimed they had image persistence, but only after using AirPlay Mirroring. That makes me think they're confusing IR with a software graphical glitch.)