I have shot medium format black & white film and like the look I get from film. Unfortunately, I cannot comment on whether I like the look I get on medium format digital since I have no experience there. I do have some very basic experience shooting black & white digital 35mm (both full frame and APS-C) and so far I prefer what I see on film. But that may change in time as I gain more experience with digital black and white.
I really don't have a lot of black & white medium format images I can share that illustrate my point but here is one. This one was shot with a medium format 6x9 folding camera on Ilford Pan F Plus and scanned. As scanned it is a 21mb image. The image I have downloaded here is a downsized copy to enable transfer via my internet connection.
The next example is a shot of the same flowers taken with my Pentax *ist DL2 as a black & white jpg image. As you can see in this example the digital image does not have anywhere near the same tonal range that is displayed on the film image.
I realize that this was not really a fair comparison, but both images are 1 megabyte images as they were sized through Photoshop. Other then downsizing there has been absolutely no additional post processing done on either image.
I realize that this is a Pentax site, and I try not to use cameras from other brands, but if anyone wants I can try this same shot using my Canon full frame later this evening to see what I end up with. But honestly I still do not expect any digital camera to produce the black and white tonal range that the Ilford film produced, even using a full frame camera.
Now I know that my inexperience working in black and white digital is showing here because I have seen some really gorgeous black and white digital work done by a lot of people on this very site. I am only barely getting started with digital black and white. But, I would also be curious to know, will digital black and white, with no post processing in Photoshop, provide the same range that is possible with film?