Why is medium format always associated with shallow DoF when on most medium format film camera systems the fastest lens will be f/2.8 or f/4 which, when you convert the crop factor is still like f/1.5
I think the only lens I can think of on medium format which would have been commonly used and super fast is the pentax 105mm f/2.4 which has to have the most pukeola bokeh I've ever seen