And in terms of pure resolution, I get about 4-6 megapixels at most in terms of sharpness when shooting ISO 100-400. Less when I push to 3200. Resolution gets higher if I use fomapan 25 or something similar, but I rarely do.
But sharpness is really not the point. I like the tonal response. I like the way I can print detail out of the highlights. I try to make my compositions clean and the resolution I'm getting is enough for me. Black and white film has a level of abstraction built into it. Higher resolution adds nothing for me.