Well, my novoflex adapter arrived today, so I've been fiddling. Here's a thread to play on!
The EVF seems to allow decent focusing, and with the grip the camera handles really well.
This is what it looks like with the Leica R 180 elmarit APO and the grip
Taken with the Leica MM and the 75 F2 (well, it would be, wouldn't it!).
The IS is a real bonus - here is a shot taken with the combo - hand held and manual focused:
so 180mm (360 equiv) ISO 5000, 1/100th
this is 1/320th at ISO 200
all at f2.8