I've just developed a couple of films, and learned 3 things
My hand held meter, a Sekonic Auto-Lumi, is under reading - the negatives were overexposed.
My Zenit B has a tapering shutter.
The lens on a Contaflex 1 is sharper than the motley collection of M42 lenses I used on the Zenit.
Read responses in amateurphotographer.co.uk