Canon have their L glass. Sony have G class. With the Nikon Z system we have S glass.
Top of the range, very little compromise.
Now back in the old f mount days, Nikon did not differentiate there top professional glass, but in general it was f/1.4 prime lens were pro and the f/1.8 were a slightly cheaper option.
Nikon caused some surprise when they released the new S range f/1.8 lens with people wondering if these were actually pro as they were not f/1.4. They have now started to fill out there range with some S glass at f/1.2.
So it was with some surprise they released a couple of non S f/1.4. It’s been an interesting choice. For those that feel the S glass is too clinical we now have a smaller lighter f1.4 lens with a bit more character.