Sorry to resurrect...

I have a Panasonic GH-2 and a GH-4. They're the same form factor as your Olympus (Micro 4/3). I like the platform very much, and at this point I consider myself to be vested into the platform.

I have the Panasonic Lumix 12 - 35mm f/2.8, Lumix 35 - 100mm f/2.8, Olympus M. Zuiko 49mm f/1.8, Voigtlander 25mm f/0.95, Lumix 14mm f/2.5, and a couple of vintage Spiratone lenses with adaptors.

The 49mm and the 35 - 100mm take really nice portraits, but the 49mm can put a little more isolation from the background if you need it. All of the Panasonic and Olympus lenses I have take really nice, sharp, and vibrant pictures. But the manual lenses (Voitlander and Spiratones) seem to have more character to them. Though, the Spiratone lenses seem to lack the vibrance of all the others...

I usually run around with the 25mm attached to one of the bodies, because I really like the pictures I get from it. It may find permanent residence on the GH-4 because it has focus peaking and the GH-2 does not. The 12 - 35mm lens may find permanent residence on the other body, because it's a great range of FoVs for most of my daily shooting. I wish I had it when I went to Yellowstone a couple of years ago.