I haven't seen the R2 versions, but I have the R1 four-movie box-set and the quality isn't amazing, but at least they are all anamorphic widescreen.
I believe the R2 version of 'Batman' is fullscreen.
Rumour has it there is a Special Edition planned for Batman and Batman Returns to be released around the time of the new Bat movie... in the mean time, go pick up the 1966 Adam West & Burt Ward TV Movie - it's fantastic for so many different reasons!!
"Some days you just can't get rid of a bomb!"