This has been a great review for me, I was trying to choose between this sigma lens and the canon 24 - 70mm f/2.8... Being new to DSLR's you helped me, so many thanks.

The closest focusing distance is measured from the sensor! Nice review nevertheless. Subscribed

thanks for the great review! 

Hey was thinking this sigma 24-105 f4 lens vs a 70-200 2.8 sigma or tamron…

At first glance, not a logical comparison, but on 2nd, it is. The Sigma is known to be significantly sharper than its Canon 24-105 counterpart. But the Canon 24-70mm f2.8 is known to be as sharp as it gets. Interesting to compare these two, if sharpness is a major issue, as it is for me. Nice review, tho a bit more on the IQ would have been all to the good.

i think it would be much better if you compare it to the canon 24-105 4l. but still great review :)

Nice Review - Looking Forward To the Sigma 50mm Art 

Sales and marketing departments fuel this misconception because it scares people into buying new lenses. Sharpness is easy to test and analyze, so magazines oblige less experienced photographers with reams of colorful charts and graphs. People would make far better pictures if they spent time learning how to make great photos with what they already own instead of worrying about their tools.

You're doing a camera lens review and you can't get the subject to focus.  You need a different camera man.

I know you have investment in canon lens but if you didnt would you consider buying D750 over 5Dm3? because I need a camera thats can be good for my sons soccer and tennis but also like it to be good with low light like for school plays. 

I was watching, thinking to myself... That American city looks exactly like Melbourne!

I think this is the first thumb down I ve ever given, and have to say it was very well deserved.

very helpful to compare apples to oranges.

Jimmy! How do you compare this to the NEW 24-70mm Canon II ?

Nice Video! Take care on the loud background. I love the Sigma ;)

Why you don't compare Sigma 24-105 vs Canon 24-105 ?  The same kind of lenses !? Not a different !