john kriegsmann said:
Canon hurt itself with that release I would have paid 2500 for a 6D2 if it had two card slots and a sensor equal to the Nikon D750. Canon has the resources to clean up on the mirrorless market if they ever got serious about it. They finally produced a good body in the M5 but have a minimal native lens offering of mostly slow zoom kit lenses.
Congratulations on your 5D4. I hope you really enjoy it!
The Canon 6D2 was designed to be a $1,500 camera (street/sale), not a $2,500 camera. But from what you've described, you're basically saying, you'd really have liked the Canon 6D2 to be a 5D4, but cheaper. Out of everyone who has objections to the 6D2, that seems to basically be what it boils down to.
But the idea of the 6D2 was to provide an entry level full-frame camera, with similar low light performance, but all around, a little less, for a lot less money.
The M5/M6 seems to be designed for size and price point, and Canon seems to have hit the mark with it, in terms of it being very popular. Here, what I think you're saying is, you'd like Canon to commit to high end mirrorless, rather than prosumer mirrorless. A lot of people who are sold on mirrorless echo this; it probably won't be happening in 2018.
But I'll tell you one thing for sure, if the 5D4 is a perfect tool for you, I don't think a Canon-made A7R3 would be, and vice versa. They're just different at what they're good at (the Sony A7R3 and the Canon 5D4), and they excel at different things.
For almost all the things I do, I would take a Canon 5D4 any day of the week. This is because I don't shoot many candids (nearly none). Everything I do is either indoors, in an environment where I supplement lighting with off-camera strobes -- or wildlife. In both cases, mirrored TTL OVF is just much more comfortable to use. However, if you like street photography, prefer candids, or do a bunch of video, I can definitely see the attraction of mirrorless.
I would love a Canon-made DSLR with many of the D850 features, but I wouldn't switch (back) to Nikon, because of a variety of reasons, mostly EF lens system, color science, and ergonomics; with DPAF a factor -- I hardly ever use DPAF, but liveview AF on a Nikon is like t2i.
Is any camera perfect? No, but I think that the 6DII is an amazing camera for its price.