I'm very very close to buying a E-M5 but I saw the SL1/100D today and it just made me think a bit. It more or less has the same dimensions except that it's substantially thicker. It's lighter (although it does feel a bit cheap in the hands) and looks plasticy. It has an optical viewfinder and I'd have access to a larger library of lenses (I think?), but any zoom/telephoto lens would be very big to carry around. My main interest however is image quality; the Canon has the larger APS-C sensor, but this is an old sensor and from what I've read has less dynamic range than the E-M5. This is where I get a bit stuck, surely this means that the IQ of the E-M5 should better? The E-M5 has IBIS, articulating touch screen, faster autofocus?, weather-sealing, looks better, and to me atleast, is better built. Has anyone had experience with both? What are your thoughts on IQ?