Having begun investing in the micro 4/3s system in 2010 and now owning an E-PL1, two OMD-EM-5s and three lenses, I feel I have given the format a good go. I was looking for smaller and lighter, and m4/3s does indeed deliver small and light. It also delivers image quality that is more than sufficient for most professional applications. I took only the Oly kit to El Salvador last summer for a week's assignment to document mission work and the photos are just fine. Also, the Olys have the most accurate exposure metering I've ever seen except for a little Canon AF35ML that I bought for my wife back in the '80s. With the Olys, I can actually shoot jpeg-only with few worries. By comparison, the meter of my Canon 6D varies all over the lot. However: I very much prefer the OVF of my 6D to the EFVs of the Olys, good as they are. And I hate, hate, hate the short battery life, even with OEM batteries. I have the Oly menus set up to pretty much do what I want without much fuss and bother, but it took a long time to get to that point. And I'm never totally sure, when I bring the camera up to my eye, that it will be ready to shoot. The Canon always is. In short: My Olys are not yet up for sale, but I'm moving more and more to the 6D. I deal with the weight issue by, first of all, getting a 6D, and second, by moving to smaller, lighter lenses. I currently have the 24mm f2.8, the 40mm f2.8, the 50mm f2.5 macro, the 24-85mm f3.5-4.5 (a light and vastly underrated lens) and the 70-210mm f3.5-4.5. I'm in the market for the 135mm f2.8, and when I get it, may carry only primes. For a quick and light out-the-door kit, the 6D with the 24-85 and 70-210, plus maybe the 40mm f2.8, while certainly not as light as my m4/3s setup, is still very good.