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Well, that's a broad... what? Overstatement? What L lens or lenses are you referring to? Do you have any images or whatever that you can provide to support that claim, please?
Yes...I know....maybe it's overstated but this is what I'm seeing right out of the camera.....I only have the lens for a few days....I'll post some images....
I had many lenses over the years(16-35,17-40,24-70,28-70, 24-105, 70-200 f4 and f2.8, 80-200, 100-400, 85, 135, 300 f2.8, 400 f2.8).
I'm not into well controlled testing...I'm basing this on my experience and I'm shooting for many years....
The only other Sigma better than the Canon was the 15mm fisheye(I had both)
I'm not the type of guy who would fire away statements just like that....but this Sigma is really good. It's worth giving it a try