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.
5D III, 7D II, EOS-M, Powershot SX50, 300/2.8 II, 1.4xTC III, 2xTC III, 70-200/4 IS, 24-105, 15-85, 100-400 II, Sigma 10-20, EOS-M 18-55, f/2 22.