The question in my mind is this: Given it'll be manual focus, why not just get the Nikon 14-24mm f/2.8 with an EF adapter, and have the extra flexibility of the zoom? From what I can see, it's the best ultrawide in existence, prime or zoom. I suppose only thing that the Zeiss has in its favour is lower weight and the ability to accept filters. But apart from that, why would I want it, if it isn't significantly better?