Attached is the 100% crop (from a 100-400mm L). And the second one of the kingfisher for not being sharp enough. When I say picky, I mean picky. Your bird pic from the 1D X is far too soft.
5DS R, 7D II, EOS-M, Powershot G3 X, 300/2.8 II, 1.4xTC III, 2xTC III, EF 35 f/2 IS, EF 70-200/4 IS, EF 24-105, 15-85, 100-400 II, Sigma 10-20, EOS-M 18-55, f/2 22, 11-22