I think the answer is partly what if any lenses you already have. As mentioned if you have a bunch of L EF's maybe skip the new system, if not go for it?
My 6D is >> my older 5D if you are talking video, autofocus, etc. Then again it was MkI of the 5D, the newer ones may have gotten better. Anyhow consider a 6D in the candidates if you haven't already.
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