Dunedain said:
I'm not sure what res they did the CGI special effects stuff at for Episodes II and III, but the most important thing is that the movie itself is only 1k. Since The Phantom Menace was scanned in at 2k, they may well have done the CGI part of the special effects at that res, or they may have done it at 4k. Because when a Star Wars movie is shown at theaters you want as much detail as you can get in the special effects to match up with the inherent detail you get with real film in the movie.

LordVader: haha :) Yeah, Lucas did go overboard with the CGI stuff in Episodes II and III.

Actually I have a followup to my comment, I recently downloaded Episode III in 720p HD (my pc doesnt run well with 1080p) and I was just trying to be funny, but unfortunately its true. Compared to the enhanced HD cgi, the objects and people that were actually filmed look quite lackluster. Prime examples would be interactions between Grievous and human actors, and Yoda's fight with Palpatine. It almost looks to me like the human actors don't belong. By far the most impressive scene compared to the SD is the space battle in the beginning, looks just amazing, if only I could see what its like in 1080p.