I want to add a comment regarding the AF of the 105 MC (with Z6 II) for general photography, as a bit of a correction to my earlier post in this thread.
I have had more time with the kit and now have identified the reasons for most out of focus shots as something of user error. The camera is prone to focus on the background if even a small part of the focus area is lit significantly brighter than the subject (where most of the focus area would be, assuming correct usage). As long as the whole focus area is kept over the main subject, the camera and lens focus with a very high keeper rate. If the focus area is too large to be entirely confined within the edges of the main subject, and the subject is lit dimly compared to the background area within the focus area box, then focus on the background can easily happen. If the main subject is lit approximately equally to the background, then often the camera focuses correctly even if the focus area has some smaller part on the background. But the best results clearly are obtained by ensuring that no part of the focus area box is outside of the subject.
Occasionally the camera cannot focus on a really out of focus subject and won't even give it a try. I consider this a bug. I think it would be good if in this instance the camera would do a search of all distances, of course this is annoying to see this happen but it is a way out of the situation. This has happened to me with the Z6 II and both 35/1.8 and 105/2.8 MC lenses, but it's not a common thing.
I think my DSLRs are a bit less eager to focus on the background even if the focus brackets include some background that is brightly lit. I wonder if Nikon are able to change this over time in their mirrorless cameras or perhaps subject recognition is a way around the problem.
