They were inferior indeed - not too much. La-5FN was equal (more or less) to 109G-2 (while further Bf.109 models were already used on the front). But just try to fight in a cockpit where the temperature exceed 40°C (indeed - 50°C, even 55°C during the tests!!!)...That is highly debatable. Soviet fighter aircraft like Yak-3 and La 5FN were not inferior to German types at the altitudes where they were fighting.
The Yak-3 had superior flight performance but a terrible survivability (as all the Yak models). The Yak-9U suffered from engine overheating, etc.
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