"Fransson shows that the 17-40mm has a very modern, punchy look with strong microcontrast, while the 18-35mm stays a bit smoother and more forgiving, especially on faces and talking heads. You see how both lenses are sharp, but the newer lens adds more "pop" that can make backgrounds feel slightly busier. That difference in rendering becomes obvious in his sample clips from the FX30, particularly when he moves between portrait distances and wider environmental shots."
"Fransson also digs into how Sigma got an f/1.8 zoom this compact and what tradeoffs come with that. The 17-40mm leans harder on in-camera corrections, while the Sigma 18-35mm f/1.8 DC HSM Art does more of the heavy lifting optically. When he puts both lenses on a full frame body, the 17-40mm shows stronger distortion and a smaller image circle, where the 18-35mm covers more of the frame and keeps straight lines looking a bit cleaner."
Sigma's 17-40mm f/1.8 DC Art is a compact wide-to-normal APS-C zoom with an f/1.8 maximum aperture and pronounced microcontrast that produces a punchy, modern look. The lens renders with more visual "pop," which can make backgrounds appear busier compared with the smoother, more forgiving 18-35mm f/1.8, particularly on faces and talking-head scenarios. The 17-40mm relies more on in-camera corrections, while the 18-35mm performs more correction optically. On full-frame bodies the 17-40mm shows stronger distortion and a smaller image circle, reducing coverage and straight-line fidelity for interiors or architectural work.
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