Between your 16-35mm and 24-105mm you've got the focal range covered. No real need to consider the lenses talked about above unless you "have to have" f/2.8 in the same range that your 24-105 covers. This is coming from a person that has 16-35, 17-50, 28-75, 70-200, 70-300mm, 50 1.8, 50 1.4 and a couple of primes...... I definitely overlap, so take heed in my advice, less you have a backpack full of lenses soon.
My excuse is I have two cameras. If you are going FF soon, might want to wait on some dealers that fit your needs better.
Did you buy this lens also? How do you like it so far?
Looks like the Sigma lens is on sale. Might bite this time. Also, here's a quote from DPReview:
"Compared to its most direct competitor, the Tamron 18-270mm F/3.5-6.3 Di II VC PZD, the Sigma measures up pretty well. The two lenses are physically very similar in size and design, and while the Tamron offers a slightly longer focal length range, the Sigma is better for close-ups. Optically there's little between them, but in our experience the Sigma focuses rather faster, at least on Canon cameras. To us, this gives the Sigma the edge in practical use."
My old coworker has one and I shot with it a lot on a Canon 7D. Now I have a Canon T4i. I'm not a pro photographer, but was happy with that lens in a lot of outdoor lit situations where I shot for fashion.
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