I love it when full-frame-fanatics say, "You can't do that with a postage-stamp-sized sensor!"
Yea, given identical shooting location, focal length, and focal ratio, full-frame has more subject isolation than µ4/3rds.
But that's not what we do as photographers, is it?
The goal should be to make the scene work for you, not accept the characteristics of your equipment as limiting what you can do with the scene.
It's not always available (birds and other wildlife, for example), but the single most effective way of isolating the subject is to get closer! You can do this physically with shoe-leather, or if you can't get physically closer, you can do it with optics. That's why I always carry the diminutive OM Zuiko 500/8 Reflex.