I just tested the S Nikkors 85 and 24mm f1.8.
Can only say these are very fine elegant lenses- wide open they are already excellent.
Wide open sharp with no colorfaults not even in the background and no coma.
Very nice bokeh, even the 24mm. I tested the 24mm against my 24mm f1.8 nikkor G.
Main difference, much better rendering of lights- no purple fringing at all.
On stopping down, the whole image is more uniform sharp and is free of chromatic errors.
I tested the 85mm against my sigma 85mm f1.4. This lens is inferior to the nikkorS at f1.8.
The Nikkor has more contrast, deeper colours and as said no chromatic problems- not even wide open- the OOF areas of the Sigma stay green till f4...
Only at infinity at f4 and smaller i like the Sigma better.
The Sigma is then more transparant and cleaner (but also more than twice the weight)
All in all the Nikon S system is growing in the right direction.
PS my 500mm reflex F8 lens has produced the sharpest foto's ever thanks to the IBIS on the Z7 - it is fun to be able to use these old lenses from the 70's.