First of all, "bokeh" and soft focus are different subjects. Think of bokeh as having someone's face in focus, for example, but having the out-of-focus background rendered in a fashion that is pleasant and undistracting, as opposed to having double lines, harsh edges, an hexagonal specular reflections. M7 lenses don't do this well at all; but then this isn't a system well adapted to longer lenses with their shallower depth of field anyway. And as far as haggling over the finer points of sheer resolution, if that kind of thing is a primary concern, or related use for big enlargements, any garden-variety 4x5 film and lens will blow away anything medium format, as long as one's technique is competent at all. Just depends what you realistically need. Some people love rangefinders, and some people hate em.