When I bought my S3 back in 1989, I also saw a glaring need to get lenses to match that 35mm frameline and 105mm frameline.
I started with the Soviet Jupiter-12 35/2.8. It really is a nice, sharp lens. I then got a Nikkor 35/2.5, which is wonderfully sharp and flare resistant.
I initially bought the Nikon S2 and S3 as curiosities, as I was doing a lot of newspaper photography at the time with Nikon SLRS. I found myself using the RF cameras for more and more working assignments, and I really needed the extra stop of the 35/1.8, so I bought one in user condition.
I'm sure the CV lens is optically marvelous. To me, one of the joys of using 50 year old camera is that the 50 year old lenses continue to be just as capable as modern lenses in taking high quality photographs.
One of the reasons the CV 35/2.5 is still so readily available is that it costs about the same as a vintage Nikkor 35/2.5, which remains a fantastic lens, and most Nikon shooters already have one of these.