For those who have experience of both bodies, where do you see the 5DIV sitting in the hierarchy for birds in flight: I have a 7Dii and am wondering if the 5DIV is a worthy upgrade. Most reviews are on static subjects looking at resolution and I am finding it hard to find anything that talks about speed to focus and tracking.
I recently hired a 1DxII and it has distinct advantages over the 7Dii especially IQ at high ISO (1600 and above) and on accuracy/solidity of focus. I am not expecting 1DxII performance from the 5DIV but wondering where it lies on the scale from a wildlife point of view.
I have a greater interest in the behavioural shots rather than prioritising birds in flight but I will always try to get the latter whenever I can.

Any advice is appreciated