"The Zeiss Planar T* 85mm f/1.4 ZA (Sony SAL-85F14Z) is certainly not an obvious choice for being used on the Sony NEX but if nothing else it is certainly an interesting experiment - especially using the new 24 megapixel sensor of the NEX 7. The Zeiss ZA 135mm f/1.8 may still be a tad better but it can certainly be taken as a benchmark lens.
The lens can be used on NEX cameras via Sony Alpha adapters. You can even use autofocus when using the Sony EA-LA2 adapter. Basically it transforms your NEX into a Sony Alpha SLT. The setup with the Zeiss lens is a bit front-heavy for sure but I had no real issues with this - other may disagree with this view.
The NEX system has an APS-C format sensor so the ZA 85mm f/1.4 behaves like a "130mm f/2" on a full format camera. The "f/2" refers to the comparable depth-of-field at f/1.4. The speed remains attached to the original aperture, of course."