Hi, Mark. In response to your questions:
We ran that 1-hour burn in test on two occasions, a couple of days apart. When we did it the second time whatever slight image sticking that was there the first time was definitely gone. Even after that one hour the sticking was very subtle, much less than on the plasma. We didn't test how long it actually took for it to go away.
With regard to black level, the OLED panel was essentially "off" when we put up a black field and turned down the brightness setting. Our meter measurement was 0.0010 nits. At the appropriate threshold setting (where we could get the deepest black and still see shadow detail) however we couldn't really see our "number one" —the lowest level box on our test pattern (you can see the pattern on our video). Turning up the brightness one notch on the setting improved the visibility of that box, but in a room with no lights on we could see the overall black level was ever so slightly illuminated. It's worth noting that we're viewing in a very dark room so any so-called illumination is quite black as well. More surprising was the black level we saw on the Panasonic ZT60 sitting right next to it with the same pattern. Its black level was running neck-in-neck with the OLED set to the higher "illuminated" setting, though OLED still had the slight edge. Quite honestly, at these levels we're quibbling and both displays had comparable black levels with any video we played on them. The OLED's big advantage here was it's overall image brightness.
I hope this helps. We just bumped up the number of TVs we test each month from 18 to 30, so I have to get back to work. Also, I want to give props to Claudio Ciacci (ex Philips), who is our head TV tester/engineer, who actually is in charge of the tests, and who has taught this formerly audio-centric writer/editor much of what I know about video.
I try not to be too self-promotional about Consumer Reports testing--I think my last post was when we were the first outlet to fully review both an active and passive 3D TV side by side--but if you'd like I'll post links when we do a First Look review of a notable TV, such as our test of Seiki's Ultra HD TV (http://www.consumerreports.org/cro/news/2013/05/first-look-seiki-1-400-50-inch-ultra-hd-tv-isn-t-so-ultra/index.htm
). First Looks are always--at least so far--in front of the paywall.--Jim