This thread belongs in the bulshitters thread!
a) blade count is mostly irrelevant for bokeh because generally (unless there are very few) you can't count 'em in the image. There are lenses with few blades and beautiful bokeh (e.g. CZJ Flektogon 35/2.4 with hexagons)
b) the dominant factor for smooth bokeh in a traditional lens is the presence of spherical aberration. It dims the edges of the blur discs, thereby reducing hard edges
c) the ultimate bokeh machine is the Minolta/Sony 135 STF due to the presence of its apodisation filter. You get blur gaussians not blur discs, therefore absolutely NO hard edges in the OOF area. It's like taking a defocused image of a defocused image...
d) second choice are the sink-strainer lenses as seen on some MF systems
e) anyone who thinks poorly of Mamiya bokeh# - on the basis of half-remembered internet "wisdom" - needs a good slap.
# or any major brand. They all have "good" and "bad" lenses and if you stick to primes, the bad are few and far between. You can get horrific bokeh from super-zooms though - again with the correction of SA to enhance sharpness often causes nisen bokeh.