For manual 35mm (not old though) the two I have used and like:
Fujian 35mm f1.7 cctv, samples here: https://www.fujix-forum.com/index.php?threads/70725/
Zonlai 35mm f1.8, samples below.
Both are inexpensive, small, and available in FX mount so no need to use (big) adapter.
The Fujian is more specialty lens with its effect, one either likes it or hates it. I didn’t like it at first, but it grows on me and makes good photos on special occasions.