I have Contax and Kiev cameras, and it's obvious that the Contax is of superior construction. I have shot my Contax with the Zeiss 21mm, 35mm, 50mm and 135mm lenses, and all produce excellent results that compare well with what I get with Leicas using similar-era glass. The Contax finder is less sophisticated than an M-series Leica, but using external viewfinders never bothered me much. In terms of reliability, I bought my Contax probably 12-15 years ago, had Eddie Smolov do a CLA on it (no idea what happened to Eddie, sorry to say), and it soldiers on without a hitch. The Voigtlander lenses produced to fit Nikon RF cameras will fit the Contax IIa, but as noted it's best to stick with the wide angles; I have never used my 25mm or 85mm Voigtlander lenses on my Contax so I can't report results -- but they do fit OK.