I have read that the Rodenstock Imagons in the early shutters had better bokeh than the later ones in the Compur and Copal shutters. The ones in the Copal shutters being the worst. Since the lenses were the same it appears a rounder aperture does affect bokeh.

Like I said earlier, I'm not a lens expert.

Like theFlyingCamera I do love my 14" Commercial Ektar.