Rad, Though I don't own nor have I ever used this lens, given the $4700 ($3100 @ b&h) price tag, I could think of several lens that I would consider before looking at this one.
1. The first and closest to the specs of the Sigma is the Canon 300 F2.8L----This lens has outstanding image quality and canon L quality build and is highly respected throughout the photography community--its not a zoom, but if you are seeking a wildlife lens, you probably wouldn't need the zoom. You can probably find this lens on the used market for about $4000 maybe less.
2. The Canon 400 5.6 is also a very good option and much cheaper. Excellant IQ, L quality, much lighter, no 2.8 aperature but is that 2 stop advantage worth the extra $$$$$$ to you.
3. The Canon 300 f4.0 L, same as above but with only a 1 stop disadvantage.
4. The canon 100-400L, very good IQ, much cheaper, has a very useful zoom range, but does have a variable aperture----This is still one of my go-to favorite. lenses for wildlife.
5. The Canon 70-200 f 2.8l IS II---- A Highly regarded lens by most that have ever used it, fast aperature, fast AF, Extremely good IQ, L quility build. Managable size and very useful zoom range. Combined with a 1.4 Extender it will give you a focal length of 280 and the IQ will still be better than the sigma in all liklihood.
6. In the focal range you mentioned is the Canon 70-300L. This lens has had some very good reviews but is a variable aperature lens as well. But for the price, its hard to beat.
7. These are just some of the choices you have, but if money is an issue, consider one of the above choices, and with whatever is left over, buy yourself some nice goodies.
Finally, If wildlife really is what you are most interested in, The Canon 500 f4L is the choice of many pro wildlife photographers---Yes, it is $6800, but if you are considering this sigma, you are already halfway there, save a little while longer and go for the big gun, you won't regret it.
Hope this helps





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