I owned the Nikkor Z 35 1.4! I honestly thought it was a sharp lens. I had no issue with sharpness my issue was with the rendering! I wasn’t a fan of the way it rendered! …. I’ve never owned the 1.8 S so I can’t speak to that!
However, I did sell my Z 35 1.4 Lens for the Viltrox 35 1.2 LAB!