Nex 7 And the Contax/Yas lenses

Thinking about the NEX 7. I would like a couple of really sharp manual focus lenses with great bokeh. The Zeiss lenses for the Contax/yashica mount were quite good, and reasonably priced.

Can they work withe the NEX 7. Focus confirmation?

Any other primes in the $300-500 range?

Thanks.