C100: New Sigma 24-105mm F4 DG OS HSM lens

DxO Labs test is out and it paints a slightly different picture in favor of the Sigma.

I think it's simply the fact that when looking at numbers, product A can seem significantly better than product B, but when looking at real images the differences are almost negligible.

However: Sigma has higher peak sharpness (almost equal to Canon 24-70 2.8 II, but only at the center and it is unable to maintain it into the corners). It also has better transmission T4.2 compared to T5.1 for the Canon 24-105 (a weakness).

Canon is better at vignetting and chromatic aberration.
 
At the end both of them are pretty much the only one in this focal range.

You want Canon L and AF working on Canon'S C line - go for the Canon.

You want max sharpness and transmission, go for the Sigma. What bothers me quite a bit is not the vignetting, but the chromativ aberrations with the Sigma. I still don't know which one will be best for me. At first glance I hated the focus ring to, but after having used the Canon EF-S 17-55/2,8 a lot I really like the focus ring being closer to the camera as I focus much more often thn using the zoom ring. I just can hold my rigless FS100 much better with the focus ring close to the camera. I will check the Sigma within the next days (after selling the Sony SEL 18-105/4,0 :( ) and decide instantly when I have both of them in my hand.

Upgrading doesn't make much sense. Both of them are pretty close in everything but the name on the lens. Sadly both are not truly parfocal (at least the ones I dealt with). I checked it with the help of expanded focus and its far away from being parfocal. I'll always use expanded focus and/or peaking to adjust the focus correctly. Just my choice...
 
Sigma should have put their resources into designing something like a constant f4 18 - 115mm ~ now i'm sure that would be a no brainer for most !
 
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