I disagree with this assessment. I have shot both systems a lot and shoot almost exclusively BIF and when the AF is set up correctly for the BIF scenario being shot, the Canon holds its own if not does better than the D5 in my experience. Moreover, the Canon system performs extremely well with BIF at 1200mm (600mm f/4 + 2xTC), something Nikon cannot achieve. Overall, I try to avoid making sweeping statements about any particular system without a lot of data from a lot of photographers. Basically, everyone shoots differently. Some people will find the Canon does better for them and visa versa. Both are very good systems and can consistently capture action I never thought would be possible to photograph with any regularity.Frankly, the Sony A9 is a pretty amazing sports/wildlife camera.
The AF of the Nikon D5 simply out performs the 1DX2. So many wildlife photographers are dumping Canon gear and switch to Nikon. And Canon does not have a camera body even comparable to the D850. Hopefully, Canon will at least close the gap if they lack the technology to take the lead.
I like my 1DX2 but the keeper rate for BIF is far below a D5.
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