Mark Hamill just finished an AMA on Reddit:
http://www.reddit.com/r/IAmA/comments/1vvul8/mark_hamill_here_in_an_ama_far_far_away/
Interesting stuff, especially this:
I'm not really somehow who goes back and re-watches old stuff I've done. I haven't seen any of the films since they were in the theater - originals or prequels. I thought the prequels are amazing by the way. If we were a garage band, they were a philharmonic.