Doc
You haven't made the best comparisons. First, the 100-400mm II is better at f/5.6 than f/8, and at f/5.6 has a slight edge on the 7DII at 400mm over the Sigma 150-600mm at 400mm f/8, with an extra stop of signal/noise to favour the Canon.
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=972&Camera=963&Sample=0&FLI=4&API=1&LensComp=990&CameraComp=963&SampleComp=0&FLIComp=5&APIComp=2
Secondly, with the Sigma at 600mm and the Canon at 560mm both at f/8 on the 7DII, the Canon is significantly sharper in the all-important centre - best seen by toggling between the two on the central circular arcs. The Sigma loses contrast.
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=990&Camera=963&Sample=0&FLI=7&API=2&LensComp=972&CameraComp=963&SampleComp=0&FLIComp=5&APIComp=0
Finally, in your last comparison of the 1.4xTC + 100-400mm II on the 5DIII vs the 7DII, it looks like the 7DII is soft - but in practice it isn't because the extra 1.5x "extra reach" more than compensates. I know this from much experience in the past. I returned last night from a birding trip to Barcelona and the Pyrenees where my wife used the 5DIII + 100-400mm II + 1.4xTCIII and I used the 7DII, and the 7DII won out every time for long distance shots.
You haven't made the best comparisons. First, the 100-400mm II is better at f/5.6 than f/8, and at f/5.6 has a slight edge on the 7DII at 400mm over the Sigma 150-600mm at 400mm f/8, with an extra stop of signal/noise to favour the Canon.
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=972&Camera=963&Sample=0&FLI=4&API=1&LensComp=990&CameraComp=963&SampleComp=0&FLIComp=5&APIComp=2
Secondly, with the Sigma at 600mm and the Canon at 560mm both at f/8 on the 7DII, the Canon is significantly sharper in the all-important centre - best seen by toggling between the two on the central circular arcs. The Sigma loses contrast.
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=990&Camera=963&Sample=0&FLI=7&API=2&LensComp=972&CameraComp=963&SampleComp=0&FLIComp=5&APIComp=0
Finally, in your last comparison of the 1.4xTC + 100-400mm II on the 5DIII vs the 7DII, it looks like the 7DII is soft - but in practice it isn't because the extra 1.5x "extra reach" more than compensates. I know this from much experience in the past. I returned last night from a birding trip to Barcelona and the Pyrenees where my wife used the 5DIII + 100-400mm II + 1.4xTCIII and I used the 7DII, and the 7DII won out every time for long distance shots.
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