I wanted a nice F2.8 70-200 lens every since my son was on the wrestling team and the low light of the gym made a lot of my pictures grainy. I did my research and narrowed my choices down to the Canon L series F2.8 70-200 IS II and the Sigma F2.8 70-200 with OS.

Lower cost than Canon lens; 4 year warranty ; awesome pictures

High cost

I shoot at a semi-pro level. This was a great lens to add to my bag. It did not break the bank like the Canon 70-200 2.8 IS. I have shot with both lenses side by side. I will say the Image Stabilization on the Canon is better just not 2x the price better.

Since I couldn`t afford Nikon version of 70-200mm, I decided to go with Sigma. I did very extensive research and decided it`s worth the money. It`s been over a month, I took maybe thousand pictures with it. I can say this I`m in love with it. It`s a perfect lens for portrait works.

Price; Bokeh; Sharpness

Smooth at 200mm

This is a great value-for-money lens. It feels great in the hand, but more importantly it focuses quickly and is very sharp.

Consistent Output; Easily Interchangeable; Quick Focus; Sharp Focus; Strong Construction

None

I purchase this Sigma 70-200mm lens as a replacement for my Canon 70-200mm lens without stabilize capabilities. WOW, what a amazing lens, on my first day of purchasing it I went out to back country National park area,I guess I can call it my lucky lens.

Lens is a little heavy, but better that cheap, light weight plastic. Lens is used mostly for shooting indoor concerts & sporting events and seems to fast focus very well.

Consistent Output; Durable; Easily Interchangeable; Fast / accurate auto-focus; Rugged; Strong Construction

Heavy

High sharpness at low price. The same type of non-third party lenses (official brands) costs twice more, but the results are very, very similar... Recommended 100%!

After reading what feels like dozens of reviews - all complimentary, I decided to take the plunge and get one of these - I do a lot of indoor fast action and kids photos, needed something fast and decent zoom. Unbelievably sharp photos, better than my prime lens...

Easy to use; Build quality

This lens is good as Nikon 70-200

Perfect

Sharp and Fast

This lens will please the most discriminating photo enthusiast and pros alike. This lens is just as sharp as the canon lens. The constant F2.8 is a big plus too. I can not say one bad thing about this lens it's that good. Buy one you will love it, and love the $$ you saved.

Quality feel; fast Auto focus and HSM motor; Tripod collar; case and Sigma warrantee

None noted