The Region 2 Japanese releases from Geneon are available in a number of different editions, including Blu-ray. I'll stick to the DVD versions for the purpose of this comparison. The Japanese premium edition is housed in a deluxe package with booklet and two bonus discs of extras, including cast & crew commentaries, deleted scenes, making-of, VFX documentary, press conferences, trailers, TV spots and music videos (no English subtitles included). The standard edition lists the same special features as our Region 4 disc, but does not seem to include English subtitles either.
For English speakers, it's obviously hard to go past the local release.