My initial review is that this camera it's going to be extremely popular with the wildlife community.
In good light, it focuses very fast and is phenomenally Sharp. If you have a decent telephoto lens, you won't be sorry. Well it's not as fast as my 1dx II, it certainly it mops the floor when it comes to resolution.
I can do without the cr3 format for the files, as it limits your options to Lightroom. I'm not a big fan of Lightroom, I do everything in Photoshop raw editor.
Buffer kept up with me all day, can't think of a single instance in over a thousand shots that I ran short. This coming week I'll be shooting several F18 practice demos and I'm sure it'll put that to the test.
I'll post some of the shots from today later on