The only real, or not, problem with a D600 is some are reporting that they need to be cleaned a few times before dust goes away. But switching to Canon means living with a few problems that will never go away, such as the consist model to model artifacts, noisy shadows and banding. With Sony, the main thing you lose is resale value. They abandon models fully when production stops and parts become very hard to find or afford. Knowing all that, and having dust ruining your photographic hobby, are you sure you really need a high performance camera, one from any maker that WILL need periodic maintenance such as cleaning?