The faster CV glass is new rather than old. I'd get just one and see how you like it. The 35/1.4 is well regarded and you can pick them up used pretty easily. The older CV glass is very good too but the newer lenses are built much better. I upgraded from the old LTM 15/4.5 to the new M mount version and couldn't believe the difference in build quality. Get yourself a standard lens (for the APS-C format) and give it a run.