Thanks for the replies on the CV 35 and the FD 20 (Phillip and others who replied).
I really want to narrow things down to just one 35mm prime for my kit.
I'm almost tempted to go the easy way out and get the FE 35/2.8 on account of good small size, modern coatings, very sharp by all accounts and AF abilities.
I keep toying with the idea of a CV (as mentioned earlier, I've already owned both the CV 15/4.5 and the CV 40/1.4 Nokton Classic) but every time I ask about them, I get turn off by the various drawbracks that keep coming up (smearing, fringing, field curvature).
There are some bigger 35s that would do well for me (The FE 35/1.4 or the Sigma 35 ART) but those are not going to give me something portable.
Now normally, I don't mind size (I'm still lugging around a couple of EF lenses for my landscape kit, namely the EF 16-35/4 and the EF 70-200/4), but I would have liked my 35 to be something I can take out as a walkaround lens and not just in "landscape" situations.