I know that there are Japanese laserdisc versions of the main documentaries, although again, I haven't seen these. I don't know what other content is included with regards to trailers, short features etc. There was some discussion in the (now defunct) Executor boxset thread, as I recall.
In any case, I suspect that the limiting factor is the source material, rather than the format, so I don't think you would see much difference between laserdisc and VHS in this case. The picture from my PAL VHS tapes is pretty good (they have hardly been watched since I bought them). I know that there has been a lot of PAL vs NTSC discussion and debate in these forums, and I don't really wish to turn Moth3r's thread into another rendition of that

Cheers,
Goose