If you want a “remastered” look, 4K77 1.4 is not what you want, since it has no DNR and is extremely grainy. You’ll probably want the 4K77 DNR release (which currently only has one version; ohteedee is working on updating it now but that’ll be a long process). It’s much cleaner, but the color timing is a little more inconsistent.
For 4K83, it’s less clear since the print was very, very clean. I’d recommend v1.3 since v1.2.2 is the “heavy DNR” version and ROTJ really didn’t need such a strong noise reduction applied to it.
Here’s a comparison between 4K83 v1.1 (no DNR) and v1.3 (minimal DNR): http://www.framecompare.com/image-compare/screenshotcomparison/DWDW7NNX