As far as some shots being grainier in 4K77, it seems like there are some scenes, including shots without effects, where there is more generational loss in the film.

The blu-ray is better for the sake of quality, of course, going back to the camera negatives (especially for shots with no effects/compositing), but’s interesting to see anyway.

Another thing I pointed out, when the last 4K77 version was released, is how soft the shots are that would later, in 2011, become “R2’s rocks”. I’m not sure if they were heavily zoomed or out of focus or what. But it made me wonder if Lucas just added the rocks because those shots weren’t really in good shape for blu-ray.