To be fair, Harmy's ESB and ROTJ projects do have missing detail compared to the Blu-rays, but that's more due to the massive compression to fit on a DVD9 than the fact that they're 720p. As Harmy explained in his Star Wars thread, the 720p HDTV source (used for the 1.0 projects) actually holds its own quite nicely when it's not compressed to hell. The 2.0 versions won't be as heavily compressed (except, of course, the AVCHD DVD9 downscales...).

Still can't find a link to that Tarkin comparison shot, which is strange considering it's been posted so many times here.