BTW looking back at this thread and now having decided to get the Nikon D810 instead.
I can see that there is a long road ahead for Leica to catch up in general IQ, high ISO and the rally fantastic viewfinder as well as the overall responsiveness of the D810 then add the by now extremely familiar layout of buttons, functions and menus,,,
The lens is on the other hand is very comparable to the 24-70mm 2.8 AFS E VR