Just keep in mind that both models earned their keep as professional equipment and many are high-mileage, worked-to-death veterans with issues. I only see the occasional RZ kit that was amateur shot; the rest are ex-pro gear. On balance, RB Pro S and Pro SD bodies seem to hold up better than the cracked and crunched Rzs with sketchy electronics friends keep showing me. They're both great system cameras but their job histories, rather than model alone, can make a huge difference. Caveat emptor, as usual.
Originally Posted by EdSawyer