As the IQ250, IQ150 and Credo 50 also have the same sensor you can look for tests made for them. Over at getdpi you have the following interesting threads:
http://www.getdpi.com/forum/medium-format-systems-digital-backs/51985-leaf-credo-50-review-guy-mancuso.html (contains real-world examples of shifted Digaron-W 40mm)
http://www.getdpi.com/forum/medium-format-systems-digital-backs/52000-lcc-23hr-35hr-40hr-iq250.htmlThe problem is that this sensor is not designed to deal with the very low angles technical wide angles deliver the light to the sensor. This means that you get leaks between the color channels (crosstalk) which means that you get a color error in the form of desaturation in mild cases.
However, if you're not into "art reproduction" color fidelity you can accept some crosstalk, and then you can shift the Digaron-S 35mm about 12mm. If your 35mm is a Schneider Digitar 35mm which is a symmetric design, it will work fine dead on but you cannot shift it at all. Digaron-W 40mm will do about 15mm shift of okay color fidelity.
35mm 135 lens would mean ~43mm for the 44x33mm sensor. Probably the Digaron-W 40mm is a bit nicer to the sensor than the Schneider Digitar 43mm. If you're not going wider than that, you think 12-15mm shift is enough and you can accept some color fidelity loss in those shifted areas (mostly not detectable in real-world images, see Guy Manusco's Credo 50 test above) it will work for you.
One thing with the CFV-50c which is not known yet is the quality of the live view. Almost certainly it will be a bit sub-standard (it was when beta was shown at Photokina), slow auto-exposure, slow update rate, not at all as a modern small format camera or the other brands using the same CMOS sensor. The reason seems to be that the digital back platform Hasselblad has is aging and cannot really handle realtime video that well. However, say if it's 10 fps without lag and a good 100% zoom it will still work well for focusing even if not "state-of-the-art" performance. I would not buy in the blind though, at least not without seeing a video and hearing a review of how the live view works for focusing.
Of course, with the RM3Di you have high precision focusing ring and you're less dependent on live view focusing (just use laser distance meter and dial in your focusing distance), if it's good enough for framing/composition I guess it's good enough for you. There are merits with high precision focusing rings even with live view, but much less so than before. Therefore I would suggest that you also consider view camera alternatives such as Arca-Swiss MF-two or the new F-Universalis or Linhof Techno, or look into Cambo Actus. An advantage with a view camera is that the lens mount cost is much lower, and when you can focus with live view you don't need to agonize over the ground glass. You also get more flexible movements (typically).