adywan said:

I'm pretty sure that ANH & ESB PAL GOUT are just upscaled from the NTSC master but ROTJ PAL has more detail than the NTSC and looks to be from a PAL master. There was a thread with some comparisons between the PAL & NTSC GOUT versions which showed this but i can't remember which one it was

I carried out a comparison of the PAL and NTSC version of ANH, and the difference in quality was negligible. The DVDs clearly use the same master as that used for the DC laserdisc - same dirt spots and so on. Thread discussing it is here.

However, this is the first I've heard of a difference in the PAL & NTSC versions of ROTJ.