These pictures of the NEX6 and OMD are pretty telling, IMO Sony NEX-6 vs Olympus OM-D E-M5 Comparison The cameras are ESSENTIALLY the same size, and pretty much speak to the state of the art in camera size. Consider that the OMD has a much better dust reduction system and IBIS around the sensor, and I wonder that the sensor packages aren't the same size. So, the NEX6 gives you a slightly larger sensor, the OMD gives you goodies like IBIS and SSWF. Then, the main other difference is the hump. Whereas the NEX6 gives you a nice EVF, the OMD gives you a stabilized EVF, even for moving shooting. So, the OMD EVF area needs more space. The NEX, of course, puts all the IS in the lens, so that's where the size there goes. Maybe the slight thinness lead in the NEX6 body speaks to the shorter flange back distance, which has been both a strength for Sony (uses all lenses from just about anywhere) and weakness (tougher lens design for a larger sensor). The systems would be a lot closer if Sony could just find some lens engineers somewhere, lol. To me, these pictures show just how close these systems really are and just what the trade-offs are, one to the other. It really raised my eyebrows when I clicked on the link.