The region 1 bluray of ESCAPE FROM NEW YORK has the original 2.0 Dolby Surround track as a secondary audio option, with the new 5.1 track being the default mix. Thankfully Fox releases a lot of MGM material here in the states, so the original mix tends to go along for the ride.

With that said, the original audio mix on the bluray is lossy Dolby Digital. IIRC, it is 192kb/s DD. So if someone were to grab the laserdisc audio and keep it lossless and/or pure PCM, that would be a sonic step up from what is available on the bluray.