You asked: "How do the CV lenses compare to the Leica and Zeiss lenses?
In my experience the M mount CV lenses are excellent picture takers that compare very favorably with their Zeiss and Leica counterparts.
You also asked: "Are the M-mount Zeiss(sic)lenses the same as their F-mount ones?"
The Zeiss wide angle M mount lenses are not retrofocus designs. The Zeiss wide angle SLR mount lenses are retrofocus designs. That said, in my experience, the performance of both the M mount and SLR mount Zeiss Lenses is outstanding.
The performance of the one SLR Sigma lens (Canon EOS mount) that I own is very good, But it does not equal the performance of my Zeiss lenses of similar focal length.