While not exactly what the OP asked, in my experience the number of blades doesn't necessarily correspond to good bokeh.

For example, my Zeiss (for Rollei) 35 & 85mm f/1.4 lenses have nearly triangular aperture openings (looks like 3 blades, but probably really 6 or more), but also stellar bokeh.
I can think of some RF lenses (presumably many-bladed - can't verify right now) whose bokeh I find pretty awful...