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I never touch my dSLR gear anymore after picking up a Sony a6000. That's a bit different than the DLs which, I believe are all fixed lenses, but the Sony and Fuji mirrorless cameras are basically tiny dSLRs (without mirrors) in features and quality. They easily rival the crop-sensor dSLRs in a smaller, lighter package.
But it's really a matter of choice and preference. My photos are mostly if not all landscape, street, and things where I'm carrying a camera all day long while also doing other things, and carrying my Canon with a big L lens on it is just a PITA. I've carried my Canon gear all over the world, and honestly, the weight difference alone made the a6000 worth it.
Many professional photographers I know have either added in a small mirrorless to their kit, or gone all mirrorless because of the benefits of size and weight while still having reasonable image quality.
That said, though, I wouldn't buy one that had a fixed lens, in that, I too would just get a pocket PoS, but for bodies with removable lenses, I'd pick up the Sony over the Canon any time. In fact, I'm seriously considering selling off all my Canon kit to cover the cost of an A7r II full frame.
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On the other hand of things, I know 6-7 pro photographers that went mirrorless and going back to DSLR. Three of them went to the A7RII within a week of it coming out, and swapped back inside 6 months. The tech just isn't ready for prime time yet. Their biggest complaints were the EVF as a whole, incredibly crappy battery life, crappy weather sealing (Sony doesn't even rate it as splash proof) and issues with the AF, especially in the cold up here.
Mind you, the battery life, weather sealing, and AF, are big issues up here. Somewhere warmer or a less volatile environment that doesn't have weather changing every 20 minutes would be better for it.
That said, I am personally very impressed with the Olympus OMD-EM1 MKII. Still low battery life compared to a DSLR, but the AF works great in the cold and it is weather sealed. At some point, I might pick one up as a travel camera so I'm not hauling my D7200 around. There are some seriously neat things you can do with different programs on it as well. Downside is I'd pretty much be spending enough to get a full frame to get one of these. So it's a solid 'eh.'
We did sell 4-5:1 of the OMD series for every Sony A7 though. Olympus usually has some amazing deals going on. We had a free battery grip, bag, etc and 40% lens (basically cost) rebate going when they first came out.