Careful, the Contax N 24-85 needs an adapter that provides electronic control of the aperture. The aperture control on the lens is more like "aperture control by wire"...so a dumb adapter doesn't work.
The MD 35-70 3.5 Macro is a very nice lens. Mine is amazingly sharp at 50 and 70, it's very good at 35 but gives a little up in the very deep corners. (On an a7R.)
The C/Y 35-70 3.4 is amazing as well.
-Tim