When it comes to BF2/FH2 I think of all vehicles as a scaled down version of the real one. With their different advantages/disadvantages over others.
FW190
Has an extremely short take-off distance, a bit to short IMO, we all know this is not a simulator but come on. Very agile and manouverable which I like, because it should be. And the firepower is immense, as it should be. Speed is good. But it really needs a different sound than the 109, but it's a first time release for this theater so I'm not complaining.
ME109
Should be fast as it is in real life. Slowing it down was a mistake. The speed/climb rate was perfect in 2.15. Making it more manueverable was also a mistake. Essentially it has been switched into a bit of a spitfire. It was really "realistic" how it was before, the spit with its speed and agility, the 109 as the fast, high-altitude one.
Stuka
I guess speeding it up a bit didn't hurt. However could have left the manueverability as it was. It should feel like a hit & run aircraft, it did, but not anymore.
Can't say much about the allied planes since I havn't really tried them out. The new Typhoon seems nice. However a big plus in flying overall is thanks to the 1.5 patch, the improved hitboxes, makes it alot more challenging.