Hi terry
There are LOADS of pros who have foregone their medium format film equipment for digital. And those that stick with their camera bodies are often using the larger sensor sizes offered by the supplementary medium format digi backs. That's why a decent mf set costs so little these days ... The Market is saturated with the things being sold by long time professional photographers. I can't remember the last time I saw a mall-type portrait photographer who didn't use a high end digi-slr or the same for wedding photogs. And their reasons for change are most likely to be about ease of use, speed of access for clients, greater and easier control over image editing than they are about the niggly quality issues (resolution etc).
That said, filmwasters isn't the place for digi bashing. We're about a positive celebration of the creaitve use of film in photography, not an endless trawl of threads discussing which is better.
