I'm looking at different medium format backs and was trying to understand the differences between a back with a smaller sensor versus a larger one.
Since I shoot only portraits, would there be much of a difference in the "medium format look" between the small 645 crop sensor of a Pentax 645z compared to a fullsize sensor that is in a phase one P65 or hasselblad H5D-60?
I've read a lot on getdpi and luminous-landscapes, but most of the conversations relating to sensor size have to do with tech cameras and landscape shooting, which I do not do. I would purchase a fullsize medium format sensor if it would make a difference with the tonality or look of the image. But I just can't get an idea if sensor size matters much within the medium format backs.