I've seen Snailman like charts around here before that show all the climb, turn, turn with flaps, and so on performance of each aircraft in the game. I think it showed both turn rate and radius IRRC.
I've only flown the Ki43 the last couple of months, maybe a few hours total time. I love the thing, surprised by how well you can do in it. The guns obviously take careful aim and attention, but work better than I thought they would. I've run into all manner of different fighters, except the Brewster in a 1v1 so far, that's what I'm looking forward to, to see how they match up.