According to the JP Preview, WKC may be the best selling HD JRPG in Japan!

[Riachu]

WKC benefitted from being on a system with 3 times the userbase of the 360. I think we all saw this coming. I wouldn't be so sure about the game being the best selling HD JRPG untill FFXIII comes out. For all we know, SO4 could outsell WKC in worldwide sales.