I took the SFDs and ADXs provided by Windii. I extracted the original m2v files from the SFDs and converted the adx files to raw .wavs and muxed them into an MKV. This should be easier for people to analyze/mess with without the need to re-encode to AVC which adds more compression. I can provide lossless .AVIS later if people want them, though they would be big.
Comparing the GEMS vs. MC version vs 25th Anniversary DVD, some observations:
-the SFDs were MPEG1 (not MPEG2) streams muxed in with the ADX. This is the reason the encoding is pretty crappy, because MPEG1 doesn't do as well with lower bitrates as MPEG2.
-The MC version is taken from an analogue transfer. The GEMs version is technically a cleaner transfer with better color fidelity.
-The ending is much much more fiddled with in the MC version than the GEMS version. The Gems version has far less frameblending it looks like. I think for the MC version they just used premiere or something and sped it up until it matched the length of the slow version of Sonic Boom.
-There is less stairstepping on the linework on the MC version but it unfortunately has a lot of bad dot crawl. The GEMs version is unfortunately host to some bad scaling somewhere along the production pipeline after it was transfered from the master tape.
-The version from the DVD that Windii uploaded looks to be from the same source tape as the GEMS version, only it doesn't contain the same stairstepping/scaling problems as the GEMs version.
-The DVD version also has slightly more vertical picture and it looks like it's been color corrected more than the GEMs version. The DVD version seems to be the clear winner in terms of best quality total.
Windii, do you mind still uploading the raw .vobs for the DVD version? I can get something similar to the above going with it pretty easily (lossless conversion to MKV). It looks like your encode was scaled down to 640 instead of the full 720 a DVD requires, and I'd rather work with the original VOB if possible.