Mitsu, I'm with you all the way on this one.
The Ki-100 wasn't the fastest IJAAF plane, but it was by far the best at 19,000+ feet.
At that altitude, it could turn *very* well, even at low speeds, due to its wingspan. It had good acceleration, good climb, and it could turn better than the Ki-61.
It out-classes the 61 in every way, except for low-level climb rate.
However, one thing most of you are forgetting is flight time. To the best of my recollection, the Ki-100 had about the same, if not more, flight time than a P-51D (100% fuel with no extra tanks).
Since most of you are too strange to fly at high altitudes, this will not be much of a factor. But face it: Flying at higher altitudes is more efficient, and makes for better combat.
The Ki-100 would be one of my top rides. It's a great plane that should not be overlooked because of its average speed.