If there are no perfect lenses then there are at least those that come close. The Carl Zeiss Sonnar T* 2.8/85mm for Contax-Yashica mount is one of those. This is a film-era lens designed for Contax SLRs. For more details, read my previous article, in which I sing the praises of this lens line as a whole. Here I will share photos from this particular optic.
Though the Contax Zeiss lenses are well-loved, you don't read much about this 85mm model, no doubt because the maximum aperture of f/2.8 seems inadequate. Why buy this lens when there are so many other 85mm focal length options? No doubt your camera system has at least one such lens, native to your mount. Perhaps it is f/1.8 or even f/1.4. So why choose a slower lens that also requires manual operation?