I ordered my G5 after having seen nice early reports from a few online testers. I bought it within the first few days of it's release. I had considered buying the E-M5, but I had a few reservations about the way the LCD articulated and the higher price. I have a preference for the LCD articulation mechanics used on the G5.
I was pleasantly surprised by the images I captured at a high school reunion the day I received the camera. I immediately noticed an improvement over my previous Olympus Pen models in dynamic range. The high ISO noise levels were simply impressive compared to the Pens. I learned quickly how to use the custom white balance setting and my out of camera jpeg files have consistently accurate color rendition. The images are nice and sharp and will likely print well at print sizes larger than 16"x20".
I believe this camera is an excellent option for those considering the E-M5 based not on a direct personal comparison but from what I seen published at many sites online.