Sigma 24-105 f/4 OS Art better than 24-105 f4L ?

This is a reason why I don't exactly see Sigma as an upgrade. That said, we all shoot differently. Some people may shoot at 24-50mm a lot and thus Sigma may be more suited for them, while people like me would not reap much of the benefit Sigma provided. And for some, even the Sigma at 24mm may not be good enough and they will just have to settle for Canon 24-70 mk II.

jrscls currently your three images just say "Content Protected by Owner" with no image (at least on my screen).

If you get them to show, do you have the same image with the same shot by the Canon for a comparison of sharpness?

In fact the Canon = Canon 24-105 f5.1L IS
http://www.dxomark.com …on/EF24-105mm-f-4L-IS-USM

The Sigma = Sigma 24-105 f4.2 OS
http://www.dxomark.com …05mm-F4-DG-OS-HSM-A-Canon

In fact 1 stop on the same f4 declared lenses is big...