UPDATE: OK. So the Takumar seemed like an inexpensive enough experiment. Went ahead and got one for around $50 on keh.com with the Fotodiox 42 to 4/3.

The adapter is a touch loose, but the lens is pretty cool. The depth of field is definitely really fun for CUs, curious to see how it performs when I'm shooting my kids running around.

Thanks for the reco.