In reference to the Dynax 9 upgrade, the camera needed to be hand delivered to the tech in Germany!
My 9 works fine with the 135 f1.8 Sonnar and has never been upgraded. I'm led to believe that the last Dynax 9's had the upgrade from the factory.
I also have the a900 and it really is a digital Dynax 9 right down to the rubber eye piece, the a900 just focuses faster!