I am not one who subscribes to the notion a certain body will only shoot certain subjects. Yeah, there may be a small advantage with a niche subject like sports vs landscapes. But in the real world, you are not going to see this difference unless you are a pixel peeper.
Believe it or not but there was a time when we didn't have any of this. There was no AE, no IS, no AF, etc. and guess what we still got the photos!
You will love the 6D along with the 24-105mm f4 L from either of the places I suggested. Then stop reading the spec charts and go out and shoot.