I bought one last week. It is a very low serial number -- 30014xx. Shutter count was 1100, sensor was clean. I have taken 500 pictures since then, and can see some spots on the upper half of the sensor when doing the blue sky at f/22 test. I'm not too concerned, I'll just wet-clean it when I start noticing them in normal photographs. I'm amazed by the image quality so far.