The ki-84 or "frank" is an excellent plane with a slightly higher learning curve than most. I say that cause of it's compressibility and speed specifications for top performance. Its always about the pilot, never the plane but all things being equal the frank should be able to win a knife fight with a jug. Only because of it's raw climb ability at slower speeds and acceleration. Having said that, the jug is no slouch. It is faster, zooms better and retains e better but most importantly it stops faster. That with it's dive ability can give any plane and any pilot a hard time if worked properly. It's about getting the kill on the first or second gun pass, but that's the game isn't it?
I'm bored at work, just my two cents from my experience.