I attended 2 day M School and the M3s and M4s felt exactly the same to me. Perhaps I'm not a talented enough driver to really notice, but I was reasonably quick. Upper 1/3 in timed events (lower 1/3 of times that is).
On a totally different note I also drove M2 and it is a go cart - it's awesome and I have to say more fun for me, but I still prefer my M3 because I need 4 doors and I love the way it drives as a DD.
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