Delved into this for a bit and built a nice set of bloomy organic taking lenses. My picks so far.
Zeiss Biotar 58mm f2 (black m42 version)
- sharp, beautiful bokeh, not too clinical.
Kiev 8b 65mm f3.5 for Salyut 88
- such a hard focal length to find but sometimes it’s perfect. Slow, and so so bokeh, but a nice flat focal length
Meyer Optik Primoplan 75mm f1.9
- essentially the softer, longer cousin of the biotar. Lots of blades, gorgeous bokeh, and a great anamorphic focal length. I got the black reissue used on BH for $1000
and the classic Jupiter 9 for the 85mm. Love the softness.