So here is the deal. I am looking for advise to see if my choice makes sense to you folks. I must admit that I have been coveting the 7D II even before the 5D III rumours came out. However, GAS is what it is and so I look for advise from folks who have the 7D II or the Sigma 150-600 (S) or both! Or others who would like to chime in. Just don't ask me to switch to another system unless you are funding me 
I am in India and needless to say that closer to the equator, the light is quite OK. So this whole low light shooting bit with the 7D II does not worry me so much. I have the 5D III for low light so I am covered - or so I think - as I use MagicLantern on the 5D III. Have been using it for a loooooong time. But then, back to the question.
Much of my shooting (attempts
) is bird photography. So more pixels on target is better. On the 5D III I believe that I get 8.66 M pixels for the same FOV as the 7D II. On the 7D II I believe it would be 20 M pixels. Another way to get more pixels on target is to get a longer lens. I currently have the 100-400L and with the 1.4x it gets me to 560mm on the 5D III. I loose some light and some AF speed. So I was thinking if I got the 7D II I would get to 640 mm equivalent @400 mm. Getting the 7D II would also get me a backup camera.
The advantage of the lens is also it's price. The down side of the lens is its weight. It is significantly heavier than the 100-400L. The lens seems to be sharp.
So people, what do you advise?
Thanks in advance.
I am in India and needless to say that closer to the equator, the light is quite OK. So this whole low light shooting bit with the 7D II does not worry me so much. I have the 5D III for low light so I am covered - or so I think - as I use MagicLantern on the 5D III. Have been using it for a loooooong time. But then, back to the question.
Much of my shooting (attempts
The advantage of the lens is also it's price. The down side of the lens is its weight. It is significantly heavier than the 100-400L. The lens seems to be sharp.
So people, what do you advise?
Thanks in advance.