CZJ lenses are very good lenses.
Flektogon 35mm F2.5 MC, Pancolar 50mm f1.8 MC and Sonnar 135mm f3.5 MC are known as Holy Trinity of Carl Zeiss Jena Lenses.
Unfortunately some Pancolar MC will interfere with the EOS mirror.
The Flektogon and the Sonnar have no issues.
Don't bother with single coated silver/Zebra version of Flektogon or Pancolar - won't fit.
There are also plenty of russian lenses with characters ... but you only asked for CZJ ...