Picture above shot at f/5.6. I have made further attempts which confirm the problem. Lens is currently on its way back from servicing, I'll see if things get better, although the service guy did not seem to have a very definite opinion on this problem, said the lens was more or less correctly aligned... I'm very disappointed with Hasselblad gear sometimes, my Bronica GS-1 never had any issues, I start to regret it.