Size-wise, it's quite similar to the CV35/1.2, though a bit narrower up front. Diameter at the focusing ring seems about the same. At first I thought maybe the ZM was a repackaged CV, but the optics are different. Maybe the narrower front end of the ZM will make a slight difference on viewfinder blockage, but I doubt it will be much different compared to the CV.
Mounting the CV on my M right now (without hood attached) and looking through the viewfinder, blockage extends as a crescent to about 60% towards the 135 frame lines. The majority of the blockage is the focusing ring. Considering that the ZM's focusing ring is narrower and closer to the camera, and with the taper of the front end, my guess is blockage will be only slightly less.
MTF values look phenomenal and pretty much eliminate any residual interest I have in the FLE. Price also seems 'OK' and the test I'm really most curious about is vs. the CV. I'm hoping to Roger at Lensrentals will eventually publish MTFs for the CV, as well as a field curvature graph comparison for these fast 35s.