I was under the impression that the ground glass had no influence in sharpness. Since it's basically a projecting screen, all the gg would influence is the amount of grain, depending of how fine it's texture. The sharpness would depend on the lens you shoot with, the relay lens and the close up lens used.

It also affects contrast, which is often visually perceived as sharpness.

I see. I think it normally reduces contrast, which helps video look more film like. But so it doesn't really technically affect sharpness and resolution? Or am I missing something?