This is all a lot easier for you Jonathan, as you can do direct comparisons.
Some of the scanner stuff goes right over my head as I have not used a scanner to understand the implications.
I had a Bronica SQA system, so out of interest I have done a bit of searching and came up with this comparison. SQA and Canon EOS 5D.
http://www.shortwork.net/equip/review-1Ds-SQ-scantech/
As for me, well I do not print larger than A4, and for that the D2X is not stretched. Even at 12 x 16 I doubt I would see the difference between a SQA image and one from the X in terms of resolved detail, so I am quite happy.
Just to show I am not biased against M/F, things I do miss :
Huge viewfinder.
Better range of interchangeable viewfinder screens.
The ability to get the camera right to gound level without having to use a right angle finder.
Less reliance on batteries. ( Used to change mine once or twice a year ).
1/500 sync speed even with the most basic of flash guns if the lens has a leaf shutter.
Ignoring the conveniance of digital aspect, things I do not miss.
WEIGHT. Body + MF finder and speedgrip, 50mm, 110 macro, 150mm PS lenses and 3 magazines and other lesser bits in a shoulder bag = hod carrier training.
Interesting thread though.
Don