I actually shot one a few days back.
Also, I just went through and figured out at least part of how I screwed up. I'd been goofing around with a 3X TC earlier in the day, and I was shooting with SR set at 800mm!
That said, I was *also* shooting mirror lock-up, on a tripod, with a remote so I'm not sure if that would have even come into play.
Anyhow, this was my handheld shot from the other night. I'm not certain of the settings, but I believe I was stopped down to f/8 or f/11
Same lens, stopped down similarly, last night. The bad IQ is pretty obvious, but I'm thinking now it could have been a distortion thing - the moon was very low to the horizon when I shot this.
Big difference was it was tripod mounted, utilizing mirror lock-up and the remote (so the 800mm error in the EXIF shouldn't have come into play as SR should have been automatically shut down for it)