I now got my 42mm adapter for my Z6, so I can take some pictures with my "new" lens.
I did the test on the Z6 @f1.8 and f4 and f5.6
Seems to cope well with shiny objects.
The bokeh is a swirling type.
Seems reasonable sharp even at f1.8.
Maybe this will be my "artistic" lens forward.
My sample of the Super-Takumar has the product code 37101, the late version.