Can't miss the BK5 out, the only really interesting feature would be the long range sniper option 

Well, as you can guess I'm even more eagerly waiting on the Mk 103. 200 rounds carrying the destructive power of a MK108 combined with the trajectory of a .50 cal.

Speaking of trajectory, I made a quick & simple graph comparing German cannons. The source is original data from
Erprobungstelle Rechlin. I tried to use similar type of rounds (mine) when possible:

Performance in AH may be somewhat different for individual guns depending on which shell being simulated.