The thread is about MF Nikkors. For some reason, I've never used these. I got interested in a 35/1.4 AIS and tested a very nice copy in a shop, just to be told that it had just been sold to another customer.
I am moderately satisfied with the Sigma 35/1.4 because of bulk and weight, plus the problematic bokeh. Probably going to re-sell it. On the other hand, the Zeiss 35/2 is easily found second-hand, and is an excellent performer, especially for night shots, or shooting against the light. This is the most common "use case". Stopped down, both are equally sharp, and visibly better that the PC 35/2.8, the latter being an interesting lens nevertheless.