I am (still, grrr...!!!) waiting for an adapter for my C/Y25 on my NEX, and this is just about the maximum size lens which makes sense to me. In that sense, I agree with, a 28 C/Y is just about the perfect single focal length for this camera, and still small enough and defintely good enough. Have fun!
I hope finding an adapter does not become a huge project ! Your ZM35 shots look great, and of course I am salivating big time. What is your findings with other FL with ZM series? Color issues, focus issues with NEX ?
Akul