i think the dialogue in episode III is much improved overall, although some of the love stuff is pretty leaden. i guess i attribute that to tom stoppard, although who knows if we'll ever know what he did and what george did. at least in the annotated screenplays book, they actually point out which lines were penned by katz & hyuck.

supposedly, or so i read somewhere, carrie fisher did some kind of polish work on the EpI script, and I think it was in the scenes with Padme. i just googled to find some kind of citation for that, but couldn't.