I loaded AH1 (AH1113T1114), and compared the 190A-5 flight model to that of the current revision of AH2. I found the older 190 to be a bit better in terms of turn radius, with slightly better handling. The differences were only just perceptible and required measurements to verify.
I then loaded AH2 version AH2095T2100 (April 2007). I tested the 190A-5 a bit throughout its flight envelope. No difference was noted between this version and current version in terms of flight model. While I have four versions of the game installed, I have no AH2 version prior to April of this year.
I personally did not see any dramatic changes in the 190s with the drag model update. I fly them some every tour, but they are not a major ride for me.
My regards,
Widewing