I have the CV 21/4 in Leica Screw Mount and I love it. I use it with an M adapter on several of my M mount cameras.
The new P version of this lens is optically the same, but has a built-in Leica M bayonet mount.
The 21/4 Color Skopar screw thread mount lens is selling new in the USA for $329.
The M mount 21/4P Color Skopar lens is selling new in the USA for $419.