I remember doing a quick comparison of the Abyss DVD against the AC-3 LaserDisc and found very little, if any difference in the audio at all. It's a really good DVD, just a shame it's not anamorphic. Picture quality is still sparklin' though.
I asked because I got a very good price on those and I'm very much excited about hearing some good LDs, after the posts that I read here. Anyway I ordered the Lost World DTS today, I can't wait to give it a try, since it's considered to be one of the best along with Casper and Jurassic Park