This 40mm Sigma lens (in my case, for Canon) retails for $799, I got mine used for about $100 less. Having owned and adored the Sigma 35mm Art lens, I decided to mix it up a little and instead buy the 40mm. I can't really comment on how much or how little that change in distance and angle affects the photos themselves, but I can say the lens produces breathtaking photos, sharper and with greater contrast than even the 35mm.
It is however, built like a tank. Good for some reasons, not so good for others, notably, it's a heavy lens. As an example, the Sigma 50mm f/1.4 Art lens for Canon weighs in at 815g, or about 1 lb 13 oz.
The 40mm weighs 1200g, or 2 lb 10 oz ... almost a full pound heavier.
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