My shots most resemble the ISOMIX version, although with a slightly more natural balance in levels, and less colour bleed. Unforunately my video seems to suffer from some sort of edge enhancement (look at the bright edge to the left of Vader in Shot A). I need to look at the sharpening filter to see if that's the culprit. [Point to note: the region 1 retail version of TPM suffered from terrible EE as well!]
I agree with eros, that DrGonzo, TR47, Farsight and the early MeBeJedi versions are all too bright - that is assuming the shots are accurate representations of the video and that no alterations occured when BadAsh took the screen grab. I believe my capture is now correctly calibrated, and it doesn't suffer from the "overblown highlights" thing that tellan was talking about.
Zion's picture quality looks very good, but I must say there seems to be a blue cast to his screenshots that is not present in any of the other versions.