JonR, Congratulations. I use the 35mm F:2.5 on my Contax IIIa, and in a lot of ways it's my favorite lens. I'm like you a long time Nikon user, but always with F bodies. With my Contax I got a Nikkor 135mm F 3.5 that isn't compatible with the camera, but it's in beautiful condition, with a leather case, caps and hood and a recent CLA by Henry Sherer. If you're interested, drop me an email. I hadm't thought of selling it, but I have no use for it at all, haven't even thought of a price.
VS