A couple things, first for potential buyers, and then about my experience with the Samsung display compared to others. I recently acquired a 2013 15 Retina with Samsung display, and here's how I did it. If you go to the Best Buy website you can look at all the open box items at the particular stores in your area. It's not uncommon for there to be open box Retinas (buyers remorse I imagine). I went to three different stores to look at 15 rMBPs and at each asked if I could i) take out the notebook to inspect it (this is a no-brainer on open box items), and ii) boot the computer up and run the code in terminal to check for the display type. With respect to the latter, I just kindly explained the IR Retina displays can have had and how the Samsungs seem immune, and how I'd like to check. At each store they let me do it and I eventually found a Samsung. Just be patient and polite about it, since they likely won't have heard of the issue, and if you don't end up buying it they'll have to restore the computer again.
About the Samsung display: I've also used the 13 Retina and a 15 LG-SJA2 in home conditions, so I'll comment on the differences. The Samsung is noticably warmer and more subdued, and I'd say not as bright. The colors don't seem to pop as much either. (In fact, I'd say the colors on a classic MBP 15 I recently used were considerably more vibrant.) This isn't to say that the colors on the Samsung are bad though, it's just more subdued, and to put it in a positive light, less saturated. The plus, for me anyway, is that the Samsung is much easier on my eyes. The LG 15 display was quite impressive with colors that really pop, but it really hurt my eyes, something I noticed immediately. Perhaps I would have adjusted, but perhaps not. The 13 I used had a great display color-wise and also had a great black levels, though it was also a bit hard on my eyes, though not as bad as the 15 LG. But I assume that not everyone has my eye sensitivites. I'm not a photographer and my work is mostly with text, so the Samsung fits well, since I get the sharpness of the text but am not overwhelmed by the display. The only issue I have with my Samsung is some backlight bleeding at the bottom of the screen, which seems to create a small cloud at the bottom that is a cooler hue than the rest of the display. It's a bit annoying, but all things considered probably not much to fuss over.