Rob, I've been shooting with a Zeiss Ikon for a couple of months now. The best thing about it is the viewfinder - bright & easy to see the frame lines even with glasses. Mechanically, everything works very smoothly. In AE, metering is spot on. I'm delighted with it & really don't have a complaint so far.
Originally Posted by Rob Skeoch
I'd suggest that how it compares with an M6 or an M7 is really the wrong question & will only lead to turf wars because Leica loyalty is so strong. The ZI is a beautiful camera in its own right, very well built, & oozes quality. It offers its owner the full appreciation of rangefinder photography without any of the restrictions of a shorter base line camera. I use a mixture of CV & Leica lenses from 28 - 75 mm.