I did my first portrait session with nothing but the Olympus EM1. It was the first time I left my trusty Nikon D700 at home. I couldn't be more pleased with the results. I used the Olympus 50-200 SWD on it the entire time. What a combo!
Here's one shot that I am quite pleased with. When I started, I had my camera set to ISO 3200 from shooting the previous night. Still pretty darn good. I processed in VSCO with a Fuji Astia 100F Portrait and then tweaked it a bit. Given I shot it at ISO 3200 I removed all grain as the files had a nice texture on their own.