I have my Japanese version... I play it constantly... no need for a second copy in ANY language... although seeing one in Pig Latin may be fun.
I mean, think about it... EVERYONE knows what KOF is all about... fighting games is probably one of the main reasons why people buy imports, simply because they require the LEAST amount of knowledge of Japanese in order to play.
Besides... my game plays in English on my system anyhow. And game system collections look THAT MUCH MORE IMPRESSIVE when you pull out Japanese imports. At least in the US anyhow...