I have been happy with the Nokton at f1.1, close range (1 to 2 meters) - so that's good. Clearly nothing wrong with the adjusting since the hardest part works and I apparently am able to focus with it well enough.
What I do not like is I have had the lens with me a couple of times in situations where I am not going to shoot at 1.1 as such, but as a "just in case I need the speed", then ended up shooting people 5-10 meters away at around f2.4, the sharpest area is clearly behind the person while the person focused on is only semi-sharp.
People in other threads dicussing this lens are saying Cosina should have implemented a floating element in the design that would have solved this but then I guess the price would have been too high..
My feeling is the lens is, for me, too big and expensive to be used only as a special-purpose lens for shooting at full aperture and well stopped-down but not in between.. on the other hand I can't really afford the 1.2 M-Hexanon either so I just have to keep figuring out whether to sell or keep the lens - and if I do sell it, what do with the money, save them or buy some nice 50/1.4 lens, and which one.
By the way, the Canon 50/1.2 also has some focus shift. Did anyone ever measure how severe it actually is?