I cant tell much difference, now that the bug is squashed. I have heard others say they are different. Most of the people told me they thought the P-47's were not as good in AH2.
The planes that I can tell a difference in are the P-51D (seems much better than before), F4U (better), F190A (worse), G10 (better). I haven't flown everything though, and these are only my perceptions!:)