It depends, there were lots of Laserdisc versions. IIRC the Limited Editions (GOUT), video-wise, match the Definitive Edition LD's, except for the opening crawl of Star Wars. Lots of people prefer the Japanese Special Collection LD's over the Definitive Editions, for example. Also, the GOUT does not have theatrical English audio, so any pre-93 Laserdisc would be an improvement in that regard (but you might get 85 audio mix for Star Wars). But no Laserdisc version has the theatrical crawl for Star Wars, so the GOUT is best in that respect.

Basically all home video releases of Star Wars fall short in some regard or another, even if you don't count the video quality that maxes out at Laserdisc-quality. You have to mix-and-match to get the best result. And that's why we're here.