This may be true for the Pan Cinor c-mount zoom lenses but not for the Cinor B primes.
The ones the original poster referenced on eBay are the "Cinor B" series primes.
Stopped down two stops, they are incredibly sharp with very good contrast.
I have shot lots of footage with the Cinor B primes.
Only thing better is the Kinoptik Apochromats but they will cost as much as a good used car.
The Cinor B's even beat the Switars in my honest opinion.
Nice lenses for sure.
Rene