I know that 'bunnies' in a spit 16 will kill 'bunnies' in a k4,
I can honestly say a Snailman in a Spit 16 would rarely kill a Snailman in a K4
in the MA. Not because the Snail is more used to the K4, but simply because he would use the terrific speed advantage of the K4 to get away at an early point. Only when you put young Lusche in his n00b days in both planes, the Spit 16 would mostly beat the K4 because the K4-Lusche would have either missed the best moment to disengage or simply would have lawn darted his plane.
But once both players are not only of the same skill level, but actually experienced sticks (and not slavishly sticking to a silly "honor" code), the K4 would die less often.