Upload & Sell: Off
CZ fans have always received the short end of the stick for tele options. Even Hasselblad was stuck with the dreadful Tele-Apotessar 500/8. In C/Y mount, one had a couple of mirror optics, and the middling 200/3.5, 200/4 and 300/4 telephotos. Now, for a wheelbarrow of cash, CZ did offer the Aposonnar 200/2 C/Y, Tele-Apotessar 300/2.8 C/Y, Sonnar Superachromat 250/5.6, and Tele-Superachromat 350/5.6. The latter two in Hassy mount are available from KEH: got $7000 handy?
For only $25,000 you can have the Tele-Superachromat 300/2.8 and matched Apo-Mutar 1.7x. This was always special order, and is probably in the current catalog. Expensive, but you get phenomenal performance, 6x6 coverage, and a nice case.
I own one of the above but, realistically, Leica R telephotos are much more attractive in price, availability and rendering.