Gary Samples and his wonderful photographs inspired me to join CanonRumors in order to post images. Gary, I must say that your images are spectacular! Thank you for sharing your images and inspiring the rest of us.
The 1DX is a fabulous camera that has opened up new image capture possibilities with its frame rate and high ISO capabilities. Whereas I don't like to shoot the 1D Mk IV above ISO 800, I routinely shoot at ISO 5,000 with the 1DX.
Shot details, all taken from a boat.
3 Bald Eagles: 600 mm, F/5.6, 1/1250 sec, ISO 5000 (rain/snow mix) , no crop
Eagle take off in rain: 600 mm, f/5.6, 1/320, ISO 5000 (it was dark and very rainy), no crop
Eagle take off from river: 600 mm, F/5.6, 1/5000, ISO 640, no crop
Gadwall in flight: 300 f/2.8 + 1.4X, f/4.0, 1/4000, ISO 800, no crop