The only time someone did was becored and I remember him being disappointed about the the differences (he lives in japan afterall) which ended up with him not really interested to run it because of the potential time loss. The japanese disc costs cheaper compared to english as well.
This was more of a future thing, and people have been asking me about future categories. Most likely though, nothing is going to really change right now and this is just future planning.
So, for a long time I have thought about if rather or not the japanese version of the game should be it's own category or not.
The japanese version has a different played out final boss fight the last four cycles of the boss you brawl on head on and it becomes completely RNG based. but it also has some fixes applied to it compared to other versions of the game. Some of these they patched out the Angler Fish Glitch, making slopes more slippery, fixing a ledge grab in shivering mountains, unable to skip the second portrait face painting and some of the globes in Wonky Circus rotate in the opposite direction.
Overall, japanese loses about a minute (not sure if it might be more, it could be) compared to US. I still haven't decided personally if it warrants a split or not. I'll leave this thread here to linger for quite awhile due to the lack of runners but I welcome watchers to voice their opinions as well.