Not the K4, or the G14 or the Spit 16, though? If acceleration is what gets you, they're right up there with the La and Spit 14. Certainly far ahead of the Mossie.
K4 and G14 are tough adversaries, but their weaknesses are something that I can easily work against. The are definitely easier to escape from due to their dive speed limits (provided I have some air under me). I don't find the K4 exceptionally dangerous more than the other 1945 monsters - that is not to say it is not dangerous... The Spit 14 vs. the Mossie is a more wierd matchup - The mossie like the Spit14 has massive torque. Like the Spit14 it is very unstable at slow speeds and can easily flip out of control. However, the torque works in opposite direction, which also drives me nuts when I fly Spit14 or Typh while so used to the Mossie - my responses are all wrong. It also means that in a matchup, a left turn benefits the mossie while a right turn benefits the 14 - the difference is huge. Against the 109s the right/left differece is not so big and I can hang with a K4 in a turn for quite some angles, either way. Also, while the Mossie is a big target, a K4 is much more likely to miss than a Spit14, and those hispanos hurt bad, so the extra power of the tater is usualy an overkill.
Spit 16, with a bit of initial separation, the mossie can extend from... on the deck... with WEP.... with these you either have to kill them in 1-2 moves, choose your timing and escape, or rely on the likely lower skill of the Spit pilot that can be exploited in a knife fight. You cannot run from a Spit14, cannot out dive it and cannot reverse E states, and he can keep pressure on you without pulling more than 3G and never get into a knife fight. Very soon some of his hispano rounds WILL connect. It is not like the Spit14 is a super plane, it is very much killable. It just can be a prolonged and annoying fight where the Mossie will be on defense the whole time.