Here you are new screenshot comparisons:
http://screenshotcomparison.com/comparison/189694
(this used just TB as source)
http://screenshotcomparison.com/comparison/189695
(note how macroblocks are removed, like on C-3PO’s head)
http://screenshotcomparison.com/comparison/189696
http://screenshotcomparison.com/comparison/189697
(the famous Mos Eisley shot seems spot on, colorwise)
The previous shots have all important color correction - the first was really pink on GKar, while a lot better on TB; the others are similar in both GKar and TB, and I used the same settings for all of them.
For the rest of the movie, I just diminished the pink tint a bit, indeed difference is more subtle, but still noticeable in a direct comparison:
http://screenshotcomparison.com/comparison/189699
http://screenshotcomparison.com/comparison/189700
http://screenshotcomparison.com/comparison/189701
(look at the sky, macroblocks are greatly reduced, and a lot less visible in motion now)