The dollar trilogy at the cinema? Wow, neither I have ever seen it and I live in Italy!
I don't know much about the restored versions and I call myself a Sergio Leone's fan. Although... still a better fan that those who call Eastwood's character from For A Few Dollars More "manco" just because it's listed so on imdb and believe that Manco is his actual name.
But I digress... the grain was indeed part of THX. As I said Lucas should have just recycled his own idea of Orwell 1984 into a new film instead of fiddling eternally with his own 70's movies, continuously updating them to the latest fashion in cinematography (such as crystal clean images and CGI-a-lot).
For me the CGI bug that substituted the rat was the biggest slap in the face.