Ah, but Olympus already did that. It's called the Zuiko 75mm f/1.8 and weighs 305g. :ROTFL:
Jokes aside, and please don't take this as criticism, just curious:
I looked at the images at dpr taken with this lens and the A9. Most of the images looked surprisingly grainy already at ISO 800. Is that normal for the A9, or is it something about the processing at dpr?
Apart from that, this looks like a great lens. When the ZA 135mm f/1.8 was launched, I was soooo close to buying a Sony camera. Unfortunately, only the A100 (More or less the former Minolta 5D I believe) was available at the time, and its viewfinder seemed even smaller than the one on my Fuji S3, so I skipped it.