I'll take an FM2 against any Japanese plane in the set except the Zeke. The FM 2 will out turn a N1k1, and it holds a speed advantage over the Ki 43. The Ki-84 is faster and can out-climb it, but I'm not going to go chasing after it like that, and here's the thing: too many people underestimate what the FM-2 is capable of. That's probably the biggest advantage.