D800 vs H5D-50c
Clearly new MFD cameras are still for studio work or landscape only, 2fps and large lenses are not that useful for sports or reporting.
Sports and reporting is probably a very low priority for any MF manufacturer
MFD cameras tend to be used in situations where you do not need a very fast workflow, nor having fast moving subjects. MF is more about maximizing resolution, about DOF control, and being able to use extremely well corrected lenses for good corner to corner performance.
The new Hassy (and the new Phase One backs and the Pentax using the same CMOS sensor) mean you get a somewhat more versatile MF camera then before. And with a significantly better live view which is not insigificant since these cameras is often used for the kind of precision photography where live view makes a lot of sense.
Yep: resolution, color depth, DOF, and better lenses to make use of those things. And better live view is always better if it's something you use. (Though I would have to think that anybody using live view a lot already has a solid external implementation at this point. Not that more options aren't better--they always are!)
Usable high ISO is very handy if ever trying to mix ambient and flash, and also offers some versatility for straight flash use. "6400" aside, even just a couple stops better performance over the current backs will be welcome breathing room/versatility.