As primarily a wildlife photographer my most used lens by some margin is the excellent Olympus M.Zuiko 300mm f/4 Pro. For a 600mm full frame equivalent lens it is light and compact these being the key reasons why I use m43 cameras. It is as sharp as any lens I have ever owned, including Canon’s big whites, and the optical image stabilisation combined with the IBIS of my OMD EM1 mkII is nothing short of astonishing.
To MC or to Crop ?
A Good Place to Stand 