I own a studio and I started my career with medium format.

I saw the light when I saw my first digital camera. I bought it.

I do miss a few things BUT overall, for what you stated, studio portraiture, IMO go digital. I now use the 5D III.

Sure there will be opinions either way but does the customer 'see, know' the difference? I don't think so. I have sold a 50" digitally captured prints and they are stunning.

I used the Mamiya RB67 then went to the Bronica ETRSi then digital. Oh, how I do not miss the weight when I shoot weddings!