But... following this comparison:
it seems there is at least one shot which has more image on HDTV...
I think I did recently read that there are a very few shots with more image on the DVD/HDTV version. Certainly this shot that was SE'ed in 2011 is less cropped:
http://www.dvdactive.com/editorial/articles/star-wars-the-changes-part-four.html (The Neimoidian Viewscreen)