The FM-2 outperforms the F4F in every category except firepower.
Up high however, their differences will become less and less.
The Spitfire V will beat the FM-2 in almost every category, - however the margin is not wide enough to allow the Spitfire pilot any errors. The FM-2 has better dive and initial dive acceleration, but that is about it. It will eventually compress before the SpitV.
The fire duration is quite some, but the punch is inadequate.
I wonder if it will ut-turn a Spitfire Mk IX, but if so, only by a margin, and then again, the Spitfire will outperform it in any other category.
Nice Plane, the FM-2....I like it