I disagree...
Doesn't matter how skilled a pilot is, if he's in a low, slow P40b he's not going to be able to nose up at all, but if he's in a low, slow spit16 he can rocket for the moon like there's no tomorrow.
Sure, skill is one thing, but the plane has an inherrent "potential" ability that the "skill" can use. One must still worry about planes with more "potential" more than one must worry about planes with less "potential. If I'm in a Ki-84, and I have 2 planes to worry about, I'm going to regard the spit8 as a larger threat than the typhoon. Doesn't matter if the typhie pilot is better than the spit pilot, because the spit pilot doesn't *have* to be good in the spit8.
Being good in some planes is a requirement, and in some planes is not. That negates the "it's the pilot not the plane" argument, in my opinion.
Back on topic, I believe the spixteen is 10-15mph faster than the Mk.VIII, and climbs just about the same (a few fps less as alt goes up). Roll rate is phenominal and turn may be slightly worse than the Mk.VIII but is still nothing to sneeze at! If you can aim with the guns you can pretty much make it through any fight intact.
P.S. Funny thing I have trouble shooting with Hispanos, because I almost never use them. I seem to miss 90% of my shots with them.