I experimented with some 35mm slides scanned at 3800 dpi (shooting at just under the scanners's rated 4000dpi produced best results - no idea why) with a Nikon 5000ED 16x sampling, usig Silverfast, etc., etc - in short, the best the scanner could produce.
I was sadly disappointed in the loss in acuity and detail vs. similar 5D or even 30D files. This with scnas that knocked the socks off the local lab's Frontier scans of the same slide.
I can't imagine it being any different comparing MF film scanned vs MFDB. Some acuity and resolution in the film is lost during the scanning process, being a second-order file (lens-to-film, film-to-CCD) vs a straight from digi 1st order file.
A wet mount scan would produce a better scan, but second order derivatives will always cost some detail/acuity - and cost you in the file size generated re: storage & required memory and processing power for PP'ing.
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I shot 35mm Fuji slides before but nearest processing lab one hour away put scratches on them two years ago. That got me into Nikon digital (50, 3 months & 200, 15 months). Well, scanning best shots from 80 rolls of film traveling rond the world in 2003 took loooooong time, another reason. Yes, DSLR beats 35mm slides in detail. Colors. No. Colors even of 35 Fuji Velvia 50 that I got back from shooting in Sichuan in China one year ago were amazing.
35mm is too small for me now. I wanted more. And, MF makes me more selective. Less photos to have scanned.
Now I shoot 6x7 Velvia 50 slides in my Mamiya 7II and ZD for MF digital. Velvia 50 in 6x7 really got me amazed and thinking. Very impressive looking at those slides. In many ways it sure beats my ZD. Assuming I do not scan all slides, as an amateur, it sure would save me lots of computer time processing. Colors are very good on ZD, but the slides are supreme in colors. I had one 6x7 scanned on a high class Epson dedicated flat bed and printed about 50cm wide. Looks awesome. Yes, it looks a little different than the slide in colors and all else, but... it sure by far beats 35mm. MF slides is different than digital, but the ZD still looks film like. Photos from other DMFBs can look more plastic. Digital does have advantages and some I much like... but it still feels as a technology still under rapid development, and not to mention that as an amateur it sure is very costly. I like capturing images for a future house... I sure am thinking if it is necessary with digital for that.
Archival is another side. I read somewhere that Fuji Astia has a color that is supposed to last three hundred years. Now that would leave something for future generations! Can you imagine that with digital? Not to mention being able sit less infront of computer...
Regards
Anders