Here's an interesting comparison I made a few weeks ago, just checking some things on my office scales: Canon 5D Classic with 24-85mm f3.5-4.5 lens (non -L and one of Canon's lighter lenses): 12 very good megapixels, usable ISO 50 to 3200, focal-length range 24-85mm, fastest aperture f3.5. Weight: 2 lbs., 14 oz. Olympus OM-D with Panasonic 20mm f1.7, Olympus 45mm f1.8, and Olympus 14-150mm f4-5.6 lenses plus Olympus E-PL1 body with VF-2 electronic viewfinder for backup. 16 very good megapixels (OM-D), usable ISO 200 to 3200 (perhaps more), focal-length range 28 to 300mm equivalent, fastest aperture f1.7. Total weight: 2 lbs., 14 oz. I've been having some problems with the OMD recently. This, for me, is what makes it worthwhile to stick with the system.