Oh, yeah, ROTJ v2.5 is BY FAR the best of all the currently available Despecialized editions, exactly because it uses the 35mm print for most shots that were replaced in the SE.
Despecialized is supposed to be a recreation of the ORIGINAL version in HD and the 35mm print is very much representative of what the original in HD is.
The Rancor shots were brightened when they were re-composited and I couldn’t rotoscope-in the mattelines, exactly because the shots looked so different in the original version. Here’s a gallery I posted a while ago, showing that I actually had to make the 35mm shots darker in order to fit with the black levels of the BD: http://picsurge.com/g/ow51Oo
The Sarlacc shots weren’t rotoscoped, because there would be practically no benefit to doing so, as they look great on the 35mm print.
There are a few shots, which probably could benefit from the rotoscoping approach, but those will be addressed in v3.0 and there will only be a few of them, where it truly will improve the quality without compromising the originality of the shots.