I have keep an eye for a copy of this lens for a long time and I just got one of those in very good condition. The price: 270 €. I went to see the normal second hand value to find out that it is half of what it used to be, from 600-500 now are down to 250-300. That's quite the drop. I'm guessing it is because the screwdriver af is not compatible with the Z system? Go figure. Anyway, the lens is in its way to my eager hands and I will share some images in due time.
I have also another one I have been looking for coming to me as I write this. Bought right here in NG. I was looking for this one even longer and more eagarly as I love it from the first time I try it. 16mm 3.5 fisheye. Oh yeah!
That´s it. I´m one lucky photographer.