iPhone 6 vs. Canon 6 D is that you probably are close to your iphone 6 all day long. But you are not so close most of the day to your Canon 6D . You carry your iPhone the whole day. And if it rains, or it pours, and you have a fairly decent camera with you. It can do things that I never could have done with the Olympus OM-2.
Good luck with your camera. Take good pictures.
I signed to follow you. and I upvoted your post. Stay well.