I not talking about AF issues in general (of course it is not perfect), but about focus shift at close focusing distance while shooting at ie. f3,5 or f4.0. It just cant be a body problem as at f 1.4 there is not problem at all. Stopping down the lens has completely no influence on AF as it being stopped down while pressing shutter, not all the time. As I said, seven different 50 1.4 from different supplies, not at the same time, adjusted when necessary with AFMA at 1.4. All of them behave in the same way. In my opinion it just can't be body failure (it hits a 1.4). How is that possible that no one experienced it?
It's not just you. I only have one copy of the lens, but the AF shifting really is a problem. It's pretty soft wide open too. Even though I like the 50mm focal length, I find myself reaching for my 85mm f/1.2 L II instead almost every time.