Do you know that La-5, La-5F and La-5FN had a lot of modifications. For example one of them used metalic longerouns. Every type had different features.
So in official test at in 1943 La-5FN had total advantage on Bf-109G2 at low and middle alt.
You can find this information at serious historical research like this: War in air (Война в воздухе) №69.
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