Well I'm sorry but I have the exact same screen A018 (3016) and I have IR. I think you just haven't look hard enough cause you don't want to accept that the computer you love so much have the issue.
Well that is a
pretty weird statement to make without knowing someone in person. Because it does not show up on the screen in my Macbook and it's also an A018 3016 you just assume I don't look hard enough because I am in love with the computer and therefore retention denial. That's pretty ridiculous if you ask me.
Bursting your bubble: I calibrate screens, mostly televisions, using my i1Pro. I have a Panasonic VT60 plasma which I am dearly in love with. However I DO see retention on this screen and I am not afraid to admit it. I just report what I see, no more, no less.
So on my VT60 plasma I see lots of retention using a grey screen (channel logos). On my Macbook Pro retina I did a 20 minutes
black&white checkerboard test at maximum screen brightness making sure the screen did not dim (Caffeïne). Switched to a 50% fullscreen grey immediately after and could not see a checkerboard pattern even if I tried/wanted to (did also try 30% and 80% grey screens by the way). I was actually surprised because I expected to see a faint checkerboard pattern, which would have been totally acceptable to me since I am used to it anyway watching my plasma tv's and don't mind it so much as long as it is not noticeable in real world content.
You see it on your screen, same model number, same production date, I believe you. (And by the way, I don't assume you see it because you hate your Macbook so much.) I don't see it on mine, though I have seen image retention many times so I know what to look for. Maybe it will show up later. But right now, it just does not show up on this Macbook, which has been used about 150 hours.
Edit: to answer your other question, yes I am aware this screen is reported to be made in 2012, since I mentioned it explicitly in my previous post.
Edit2: one final note, before I upgraded to this MBPr I had the MBPr 2013 base model with a screen (A020) that DID have some image retention using the checkerboard test. No big deal for me because it was very faint, but it was there.