When I purchased my E-M1, I had no m4/3 lenses. I ended up using the 14-54mm II lens, and selling off the other 4/3 lenses.
I feel that this 4/3 lens meets most of my needs and feels "just right" on the E-M1. I normally use it in the 25-35mm range.
Since then, I have only purchased the two "body-cap" lenses (9mm "fisheye" and 15mm) "just for fun".