You are a good photographer, but I'm going to challenge you on the above statements which I believe to be untrue. It appears your experience with MF files is mostly analog and I wonder how much you've really worked with a MFDB because were you to have used one extensively I'm certain you wouldn't write the above. I presume you are only basing your statements on DXO values or brief experiences with very old digital backs. The DXO comparisons between DSLR and MF are misleading for a number of reasons already hashed through.
And I'm sure you know from your fuji 680 that the roll off of focus with larger formats is much faster and that you can't compare f/stop to f/stop in terms of DOF from format to format. I witnessed in the studio that shots on the d800 at f/10 had broader DOF than my AFi-ii 12 at f/16. You can't tell me that the nikon with a f/1.4 lens is getting better blur than my AFi-ii 12 with the 50/2.8, 80/2, 110/2 or 180/2.8.
My experience is based on many years, not only still photography, but also extensive color grading and effects in motion picture and working with color suites that cost $ 1,200 an hour.
Lets avoid the personal attacks
However you do bring up and point that I should have mentioned. Three exceptional MF lenses. The 80/2 Ziess, the 110mm f2 Ziess and the Schneider 180mm 2.8. The three most exceptional lenses in MF 645 or 6x6.
Plus they are also "empowered" by the viewfinder options of the camera they go on. With the Rollie it's much better for working wide open than the Hasselblad and Phase one cameras.
Oh silly me to leave out the best MF digital.
However I think it is safe to say that the bokeh of several Nikon ultra fast lenses is nicer than the 2.8 and slower MF lenses.
Here is an example of the bokeh of the 85mm 1.4 I found on flickr. (not mine, sorry can't post them due to releases and celb subjects) Fell free to post better bokeh from Phase/Schneider lenses or Hasselblad H lenses. Significant problem with them is the 5 blade iris. 9 http://www.luminous-landscape.com/forum/index.php?topic=67434.msg533454#msg533454
) Stop down one stop and it's not nice.
Nikon 85mm 1.4
by Oleg Shcherbakov
more of his images here: Higher res too. Keep in mind these are very busy backgrounds. Look at how cleanly the foreground and background are rendered.
Also keep in mind that the lighting here is quite soft so there is little depth added by contrasty light and rim light effectshttp://www.flickr.com/photos/-451/