I was fortunate to receive my E-M5 in mid April. It's an amazing camera and I have been loving shooting it. I set out on a road trip last week and noticed a round dot in all my sky shots in the upper left. I cleaned every lens, it was still there. So I looked through my earlier shots with the camera and saw the dot had been there from the beginning, it was just more apparent in shots with a lot of sky. I was traveling by train so I knew I would need to find a camera store once we stopped in Denver. I went to see Tim at Mike's Camera in Denver. He cleaned the sensor for me, gave me a great deal in the grip and I headed back out only to see the dot was still there. I went back and we checked it on a sensor scope, there is a flaw in the glass filter covering the sensor. After trying to clean it for about 30 minutes it became clear that it wasn't dust. I'm sending it back to B&H for a replacement as soon as I get home next week. I'm shooting it a lot on this trip, knowing I will have to crop the upper left in every shot. I fallen in love with this camera, and now I'm at the back of the list for a replacement. At least I hung onto my E-P2.