Over the last 20 years I've used (in some cases only briefly) 5 lenses on the Poll list, plus the CV 35/2.5, an old Elmar 35/3.5, the tri-Elmar f/4, a Canon 35/1.8, and a Canon 35mm f/2.
The ones from the list were: CV 1.2 Nokton, Summilux pre-ASPH, Summilux ASPH, Summicron V1, and Summicron V4.
In my experience, they are all more-or-less great and/or very capable lenses. (The Summilux ASPH and the Nokton 1.2 are the overall best optically in IMHO). But I ended keeping the Summicron V4 as the best FOR ME in terms of all-around size, ergonomics, optical and mechanical quality, filter thread size, and price (I got an optically perfect "beater" for a good price).
I actually preferred the Summicron V1 to the V4 (my example of the V1 was extremely sharp in the center of the field, with very pleasing overall imaging character, and the build-quality was better than the V4). But, it was chrome and I wasn't crazy about the "chrome lens on black body look". If I ever in my life find a BLACK PAINT Summicron V1 that I can afford (yeah, right), then I will switch and "be done".
Other thoughts: trading away the Summilux ASPH was painful, as I really loved it (not as big as the 1.2 Nokton), and really lovely images, but ultimately I decided to not have "duplicates" in any given focal length (except 50mm which I just can't help - I got a 28mm Summicron ASPH for it, so that eased the pain.
The CV 35mm f/2.5 is really BY FAR, the best bang for the buck, IMO. Fantastic image quality, and small and great ergonomics. If I ever need to make some lens decisions based purely on economics, then this is the one I would buy.
This is probably just me, but I HATED the Canon 35mm F/2. I thought the bokeh was intolerable, the weird filter size and ergonomics were just nails in the coffin for me. And didn't focus particularly close if I remember correctly.