I was tempted by the Contax IIa, but restrained myself. It is gorgeous! but money is a concern, since I don't want to buy shelf queens. So I scored a Nikon S2, certainly inspired by the Contax, but available in good user condition for far fewer dollars.The Nikons and Contaxes can use the same lenses, below 50mm. Some stupid difference in something or other....
Sadly while the S2 with its wonderful f1.4 is not expensive, the lenses can be! With care I've gotten the Voigtlander 21 and 35mm wide angles, and the Nikon 105 and 135, plus the Varifocal viewfinder. Not a cheap kit, but the sense of "history" when using tangible.