[JJ_SO]

Is MF going really to be that much better bang for IQ?  Shallower depth of field is possible with large aperture lenses, but they will be monsters, expensive ones, you can get sufficient shallow DOF now with the latest F1.4s, matching DOF on FF will need only one stop less (F2?) and with that frame coverage we are talking 3-4K a pop, or more. There will be will no doubt be older adapted Pentax MF lenses at ever increasing prices,which will also disappear fairly quickly.

 

Dave, there's more than IQ (in terms of resolution and other parameters to measure). If you go larger than FF, not depending on MP-count, you get necessarily longer focal lengths. These change the proportions of in focus / out of focus parts in a picture. Wether that's to my taste or not, the curse of larger than FF formats is shallower DoF - and the best pictures of these cameras not only convince by the amount of detail but also by isolating the subject much more than fast FF lenses can.

 

I had better bokeh with a 110/2.8 in front of the Mamiya 645 than I had with a Zeiss 85/1.4 in front of a Contax/Yashica. Not to mention the difficulties in focussing very fast lenses with only a matte screen in a comparatively tiny finder.