Sigma 20mm f/1.8 lens review with samples (Full-frame and APS-C)

This is probably one of the most interesting lenses I've gotten my hands on to review in a while. This lens has an extremely wide aperture for such a wide angle. Can such an extreme lens design possibly also have good image quality? And is it good enough nowadays for the challenge of a 20 megapixel APS-C digital camera? Who knows...well, actually, I do.

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All photos and video taken by me and Kathryn Sadler on Canon 6D and 70D cameras.

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Music:
'Opportunity Walks', Kevin MacLeod (incompetech.com)
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