pKai Offline Upload & Sell: Off
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I want to see this comparison too! Done well in both lab and field....
The 100-400 II, which I have, will be a pretty hard act to follow even with 1.4III attached. The obvious upside to the Sigma is having all focus points available at 600 versus the 100-400+1.4 which will only activate the center point.
I was holding out for a 150-600 after renting one but then after seeing the stellar performance of the 100-400 and the Sigma's lack of availability, I went for the Canon. Anecdotally (I say this because I didn't have both lenses at the same time to do a side-by-side), comparing the Canon+1.4 to the Sigma bare, I would predict the advantage goes to the Canon on IQ and the Sigma on AF due to the focus points.
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