I posted a recent thread asking for opinions on a Lens for an up coming trip to South Africa later this year and the new Sigma 100-400mm was mentioned along with a few others. The Sigma 150-600mm was also mentioned but I think this will just be too big, as well as the obvious Canon 100-400mm L II lens.
So, I have been doing the usual reading/watching reviews etc on line which has now created a few more queries I'm now thinking of either splashing out on the Canon 100-400mm L II or saving some money and going for the new Sigma 100-400mm.
From what I can find out so far the Sigma seems to be more or less on par with regards to image quality comparing with the Canon 100-400mm L II, however, going by the very few reviews of the Sigma 100-400mm, the ones that I can find seem to report the AF is not that great especially with subjects moving towards the camera?
My use will be on a 70d and I will be using it for the Safari later in the year (private game reserve so up to 400mm should be ok) and my main other use is Motorsport (hence the slight concern with AF).
As well as my 70d I also have the 18-135mm kit lens and also a Canon 70-300mm IS (non L) lens. I was actually using the Canon 70-300mm lens only yesterday at a motorsport event and to be fair to it, it seemed to serve me ok but I guess either the new Sigma or Canon 100-400mm L II would be a big improvement?
1) I was wondering if anyone may have/used a Sigma 100-400mm and could comment on the AF speed/any issues?
2) Should I just stump up and get the Canon and be done with it?