>>3937850any russian lens, Helios-44-2 especially, just make sure to NOT get one from a valdai plant
https://radojuva.com/en/2015/04/gelios-44-helios/picrel is not shot on film, but it should give you an idea of the look this lens provides. This specific lens is the h203-a type from the link above
I've heard a lot of good things about the Industar-50, Industar-61, the various Takumars, and the Meyer Lydith 30mm. But I don't have experience with those.