All of my lenses are manual focus Nikkors. But if you are going to use manual focus lenses with autofocus cameras you are going to have to live with the fact that their focusing screens are not suited for the task. In fact, they suck. The focus indicator is a decent guide, though I have found it is wrong as much as it is right, at least in the D700, and it will not work in light low enough to cause your autofocus to give up as well since it works off the same system. When I got my D700, I also got a manual focusing screen from focusingscreen.com with a microprism center and ground glass for the rest of the screen. That is the only true way to ensure you are in sharp focus with a digital camera and manual focus lenses.
And personally, as far as Zeiss goes, save your money, get a Nikkor instead and for the money you save getting the Nikkor, you have enough to maybe get another Nikkor.