When I finish TOS I plan to dive right into the film series but I made sure to track down all six lds first. I had gotten the bds bundled with TOS and popped some in to see for myself…oh dear…
From my research notes it appears the initial DVDs were ports of the ld masters: some with 5.1 remixes of the 2.0 and the sequels were non anamorphic. The SE reissues cleaned all of these up and some may have 70mm derived 5.1 tracks but this is unconfirmed. Also the contrast may have been tweaked on some but without seeing for myself I can’t say for sure.
Anybody have both DVD runs?