My experience with the ZF 100/2:
Highest resolution lens I've used on the D800 camera. All the way from close to infinity. Lovely bokeh at all stops. Heavy. Only major optical drawback: Axial CA is corrected to about the same degree as my Nikkor 85/1.8 K/Ai from 1976. In extreme specular highlight scenes that commonly induce display of the axial CA, you can mostly get rid of the CA by stopping down to f/11 or f/16. It'd be nice if it didn't have this issue.
At US$390, it is a very good deal. These originally sold new for US$1800...Ask me how I know! I've gotten some incredibly high-resolution stiched landscape panos from the ZF 100/2.
