If you have enough for a Leica 1600B then go with that. I had a CRF 1000 and then got the PRF for more range. It will range soft targets out to 900 or more and hard out to 1500 (so far). It is larger than the Leica, but the image quality is top notch.
The Zeiss is going for approx $450 in the secondary market, it is decent, just not a Leica.
Leica 1000 < Zeiss PRF < Leica 1600