For a long time I thought about extending my equipment into the mirrorless arena. In South Georgia I wanted to use a very lightweight equipment for situations where I needed long to very long lenses. My current Canon equipment with a 600mil and the EF 100-400 in combination with aa APS-C body seemed to be too heavy to carry around all day, expecially as my main body is and will be digital medium format.
After a long gestation period I decided to go for MFT with its unbeatable performance/weight ratio.
Moreover I needed a lightweight backup for my heavy medium format equipment, just in case it would fail (which never happened so far....).
After some initial problems with lens compatibility I am so far quite happy with the results. It is on par or better than the Canon 7D II + EF 100-400 (II). The 600 mil lens is far ahead in quality, but it is just impracticable to use on a trip to South Georgia.
The electronic viewfinder maybe not as nice as an optical, but the advantages are just too big and I know anyway what I want to photograph regardless through which viewfinder I do my composition.