I think only Panasonic and Olympus make M43 bodies, so effectively yes, Panasonic is now the only one - though there are a few other companies making lenses sti

I think only Panasonic and Olympus make M43 bodies, so effectively yes, Panasonic is now the only one - though there are a few other companies making lenses still. The bodies are presumably going to be the more difficult thing to replace. I have a number of M43 lenses, and I'm concerned about how long I'll be able to use them for - it's not like the simple manual-focus lens days of old when you mostly just needed the right thread adapter. I've owned three Olympus cameras. The first was a mju-1 compact camera in the early 90s (known as the Stylus in the US - the original one before they added a zoom). This was a remarkably good camera, with a great lens at a nice practical 35mm focal length (like the old Trip line, which I never got to use) in a really stylish body. I sold it a few years later when I really needed the money... The other two have been M43 digitals - an E-PL3 (now in use by my kids), and an E-M5 mark II, which has been my main camera for a few years and which I am very fond of.