100mm IQ comparison, Sigma art vs Canon EF

100mm is my golden length for portraits; after many years I found this length testing many times 85mm, 135mm and zooms and I always found the first too short, the second too long and 95mm,100,105mm on the latest.
That made me the easy choice to go on Canon EF 100mm f2, the smaller 135mm f2  (yes, beside the form factor is the smaller sibling of 135L f2 , not the bigger of 85mm 1.8!), an old design made by Canon many years ago with superfast AF, nice IQ and just some CA as main flaw. 

After many years of use, I swapped to Sony from Canon and I started adapting with Sigma mc11 my Canon EF lenses; general performance was even better thanks to the new sensor, IBIS and the IQ made by a camera without AA filter.
I also found a smaller problem: the AF wasn’t enough responsive for running children or fast movements.
Mc11 has limitations, the burst limited on 3fps if you want a fast AF and the speed with tele photo lenses (100mm and 200mm in my set) always a problem if you have the need of solid and constant performances; last but not least, the focus area works weel only around the central third of the frame.
I had to find another lens for my purposes, an FE lens; Trying to have the best quality of bokeh, a solid AF and an high quality lens to be able to crop when needed for prints, I found with Sigma 105 1.4 art the solution.
Huge, solid, fast af, expensive, great bokeh…. but how big is the difference?
LET’S SEE!

first test:

f2.0 (some differences on the frame cause the size of the lens and the 5mm of focal lenght)

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CANON

SIGMA

After this test , first thought is “wow 1kg more, 1K euros more and just that difference?”.
Yes, the difference if we are just talking about IQ is that:


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No CA, shaper, smoother bokeh.

If we add that to a better and solid AF we have something to motivate the upgrade.
But this lens is 1.4, let’s see what that means?

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You can see what I found using this majestic lens, called Bokeh Master!
Below is the comparison between Canon at f2 and Sigma at 1.4..
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The “bubble” around the subject, the isolation and the crazy sharpness wide open make the difference.
I almost took my decision to keep the new Sigma 105 1.4 art inside my kit.

PS.

I also have a Canon 200 f2.8 lens, supersharp and great on Sony a7r3, but with inconsistent AF, even worst than the 100mm.
What about the bokeh compared to the Sigma 105mm?
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105mm on the left, 200mm on the right

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Perhaps I can use just one lens for all my portrait purposes…..

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