The problem for the 109F was that it had to hold the fort for a bit too long - pretty much all of 1941 and well into 1942 (109G being introduced in small numbers initially- in June 1942 in North Africa, and I think it first appeared in September 1942 in Russia). I would argue that the Bf 109F series was substantially ahead of all Allied designs in 1940, but Allied fighters were coming closer to parity by the end of 1941 and were challenging Luftwaffe supremacy by mid or late 1942.
Of course Franz were upgraded steadily to the F-4 standard which was certainly much improved over the F-1 or F-2. But by mid 1942 it is contending with Spit Vc, P-38s, merlin engined P-40F/L, souped up P-40K, and Yak-1B and the La-5... in the fall you also saw Yak-9s and La 5 FN coming online, Spit IX at least over England. The gap was surely closing.
Meanwhile the G series, or most of them anyway, were really more optimized for the high altitude fight over Northern Europe and destroying bombers. I know people would debate this but I'm not sure a 109G-6 is actually better against fighters, especially at low altitude, than a 109F-4. The Fw 190 owned the Spit V but that advantage disappeared with the Spit IX.
Of course Franz were upgraded steadily to the F-4 standard which was certainly much improved over the F-1 or F-2. But by mid 1942 it is contending with Spit Vc, P-38s, merlin engined P-40F/L, souped up P-40K, and Yak-1B and the La-5... in the fall you also saw Yak-9s and La 5 FN coming online, Spit IX at least over England. The gap was surely closing.
Meanwhile the G series, or most of them anyway, were really more optimized for the high altitude fight over Northern Europe and destroying bombers. I know people would debate this but I'm not sure a 109G-6 is actually better against fighters, especially at low altitude, than a 109F-4. The Fw 190 owned the Spit V but that advantage disappeared with the Spit IX.