I got to handle a Zeiss Ikon last week at B&H. A beautiful, solid camera with an outstanding viewfinder. The only reason I didn't get it is because I shoot left-eyed and the meter/shutter speed indicator is on the left side out of view for me. Otherwise I'd have walked out with one of those and a Nokton.

Oddly enough, the cheaper (in price and feel) R2/3 has its metering on the bottom but I didn't like the feel of the body at all.