I sit in a home office surrounded by prints from Mamiya 7II drum scans and prints from a Mamiya ZD. My view is that the ZD is marginally better, even though the Velvia drum scans reveal slightly more detail at the pixel level when viewed on screen (just a rough estimate as I'm not comparing identical shots). Dynamic range is no contest, the ZD is a mile ahead, although I am using Velvia as a reference point; Provia has wider dynamic range as everyone knows.
You can hand hold the 7II at very low shutter speeds, which is not the case with the ZD.
Much as I loved the 7II, I would not want to go back to it after using the ZD.