What do you want to know?
The MF sensor is the same Sony as in Nikon D800 series but bigger.
The two main things I'd like to research are:
1) The incredible DR and shadow recovery of Exmor sensors is well documented, so no need to beat that horse here. What impresses me the most about the 645Z (and MF in general) is it's ability to render final tonal gradations far better than 35mm. My question is, will this actually show up in print?
My editorial clients use very low quality paper, printers, and ink. For that type of work, I feel that the on-screen tonal range advantage of MF wouldn't translate to the end product. On the flip side, my commercial and advertising clients have much higher printing standards and budgets, where there's a far greater chance of the IQ benefits of MF transferring over to paper. In general terms, how good does the quality of printing/paper/ink need to be to realize the tonal range advantage of MF vs. 35mm?
2) How user friendly in the field is the 645Z it vs. a modern 35mm DSLR? Before upgrading to the 5D3, I slummed it with a 5DC for many, many years. I can't image that the AF and overall handling of the 645Z could possibly be more of a pain than the 5DC.