I don't think there is much you can do against the MKII in a dogfight. You need to do maximum damage quickly or the tables will turn. I shot down a few tonight but they were mainly bounces or green pilots.
I've always said once the bugs get ironed out I'll get my a$$ handed to me once the good spit fliers arrive en masse online, but until today I don't recall being shot down in the 109 by a human Spit.
I've managed to always keep my E up and mix it with the Spit, choosing to even turn hard when I know I can build my E up etc. I haven't been worried about meeting them at co alt either, as long as we aren't near the deck.
However, now that Spit 2 has changed my thoughts on this. I'm going to be a lot more careful now but how do you even disengage if you don't' want to fight, he'll just reel you in eventually? Anyone looking for a wingman?