My first copy of the CV Nokton Classic 35 had terrible focus shift problems (bad enough to send it back for an exchange. thankfully the second copy, not so much), and the Sonnar doesn't even come close to that lens for focus shift problems. That said, I suspect my copy of the Sonnar is optimized for 1,5 and not 2,8- making any shift such a minor problem on my copy. I probably unconsciously compensate for it now.
We're all good here, just sharing that I've not noticed it with my lens.
Shift, schmift. I don't even notice it. The lens is perfect as is.
I'm sorry you got a difficult copy. Mine is still just fine.
So you are able to hit focus in a pro-like snap of the wrist and fully concentrate on your subject at any aperture?....I guess I am confused...😕