Hi,
i doubt the F4F would have done as good as the P40 in Europe. The speed/climb performence was just as good as that of the HurriII. The P40 was way faster, specialy in a dive and additionally the P40 had excelent high speed handling.
Even the FM-2 was poor in relation to the 1941-43 German fighters, no matter what altitude.
It was a good carrier plane and specialy in the pacific, where it did face most of the time planes like the Zero(not to talk about the Japanese bombers), which had no real protection and which also had a rather poor performence, it could shine (somehow).
Vs the MG151/20 armned planes in europe, even the toughness wasnt a real bringer anymore and easy snapshot kills like vs the Japanese paperplanes also wasnt as easy in Europs.
The F4F could shine in the pacific cause its thoughness(in relation to the japanese guns), the japanese paperplanes and good teamfight. The F2A would have done same good, if they would have used the same tactics.
How different the performences in the Pacifc and Europe was you can acttualy see, if you look to the P38.
Even the early P38F and G´s was so much more fast than any japanese plane of that time(1941/42), they could act somewhat like the 262 in 1944/45 over europe. Of course with the same turnfight problems. Her, in the pacific, it was vastly superior.
In Europe even the P38H and J had bad trouble, cause vs the 109G and FW190A they dont had a real speed advantage, neighter they could turn better, as result the P38 did not count as superior, rather as disadvanced in combat.
The not to bad results of the P38´s over Europe was then rather related to good pilot training/tactics and tot the fact that many german fighters was overloaded(still the P38 had trouble with them, unlike to the single engined fighters).
Greetings,
Knegel