These are two completely different cameras, so the choice would depend on your reason for purchase and on what you plan to do with the camera.
If you want a more modern (relatively speaking), very competent film camera with an unusually good lens, I would get the Minolta. Note, however, that the MC Rokkor lens will work perfectly in manual mode and with aperture-priority automation, but it isn't designed to work in the X-700's program mode. For the program mode, you really need a later MD Rokkor or even later MD Minolta.
You would get the Zeiss if you are a collector or if you specifically like to use old German cameras. Note that the older the camera is, the more likely it is to be in need of servicing to function as it should.
By the way, an MC Rokkor doesn't mean that it's multi-coated. The MC stands for "meter-coupled." I think the late MC Rokkors might have been multi-coated, but most of them had "Achromatic Coating," which was a two-layer type. (I have the 50mm 1.4 PG Rokkor lens with the rubberized focusing collar that you might have available to you and I'm pretty sure that it's multi-coated.)
The MC Rokkors were succeeded by the MD Rokkors, which had additional indexing tabs and faster operating diaphragms for shutter-priority and programmed automation. The MD Rokkors were all multi-coated, to the best of my knowledge.
- Murray
