Here is the requested proof of the image retention on the late 2013 rMBP:
http://youtu.be/qCPYJnsWbuo
I just uploaded it now, so give it a few minutes to let it process. But the video should show that IR does exist.
Now to put it into context, within the time it took me to figure out how to upload the above video (2-3 minutes?), the checkerboard has dispersed from my screen. Whether if this spells long term issues or not, I leave it up for you to decide.
Thank you for taking the time to make the video. I'm pissed right off now. Lol.