My opinion is it is not even debatable. FF sensors for RFs will be out in no time. No one is going to have to reformulate all the wide angle optical formulas into "reverse retrofocus" designs. Soon everyone will have FF sensors that capture light at any angles, or are able to competsate for it. It is just an engineering problem that has to be worked through. We flew to the moon and back using pre handheld calculator technology. I've been a Ph.D. chip engineer for the past 10 years. In my general observation the technology no matter what its nature will always adapt to what the installed base is. In this case the sensor has to adapt to the huge installed base of lenses out there; the tail does not wag the dog. Cheap FF sensors in both RFs and SLRs are inevitable; cropped sensors will be evolutionary junk that we had to live with because there was nothing better. This all does not mean I am not buying an M8 soon to compliment my MP 🙂 Let me ask you M8 owners this: is the shutter bigger than the sensor? I mean, if they could retrofit a FF sensor in the M8, would the shutter open wide enough to expose it? Cheers!