7D has MANY more focus points, and way faster fps than 6D. IQ-wise, my 6D wipes the floor with my 7D without breaking even the slightest sweat. I've become so spoiled by 6D IQ that I find myself instinctively trying to capture moving subjects - birds, mostly, that I'll NEVER be good enough to capture with it, than just grab my 7D: despite its still-great specs and features it has become just a second body, emergencies only, for me. Unless all you shoot are fast-moving subjects, you will find yourself pretty pleased with the 6D - and still have some cash left for another lens or flash or plane ticket...