I'm also fortunate to have both 7D and 5D3. They make a great pairing with many similar features and button layouts. I think the 5D3 focuses even better than the 7D.
I can say without question that the MK3 blows the 7D away in the focus department. I also own and use both regularly and my hit/miss rate is 2-1 ore more in favor of the MK3 on every outing.










