That's a great capture, the 1D3 obviously likes this lens!
just done a large crop (2.6mp ) of a puffin launch off at bempton cliffs ,1dmk3 10mp,sigma 150-600mm sport ,hand held .spent a fair bit of time correcting blue (reflected sea/sky) colour cast on the cliffs quite pleased with this result .
I took my Sport to the Flying Legends air display at Duxford yesterday.
I bought this lens on the evidence of this thread and Brad Hill's recommendations, took it out to Spain with me this weekend and was very happy with almost the first shot I took with it - camera is a D7100, hand held.
The shot has been cropped by about half, and resized but no other processing undertaken. All I need now is some arm-strengthening excercises...