Summary: This is a great wide angle lens. If you're looking at L glass you probably already know you're going to pay an arm and a leg but you also probably already know the quality as well. I bought this lens to go wider than my 24-70 and man does this do a great job! Since buying this lens 2 weeks ago I have not once reached for my 24-70 lens for a landscape. This is my go to landscape lens.
Excerpt: Canon Wide Angle landscape quest. I have the 14 Rockinon, 21 Zeiss, 24 TSE, 24-70 Canon, and more. All very different. I ordered 2 of the 16-35s to test. Copy 1 decentered on left side. This lens renders like the 24-70 more than any other. The distortion at wide end is less than expected-less than Zeiss 21. The sunstar is out of this world. Color good, Ez to manual focus. Very solid all rounder. It is not as sharp as any of my current lenses.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Rugged
Excerpt: So far I've tested the lens by shooting some landscape work and shooting indoors; both in varying conditions. Background: I'm shooting with a 7D and I'm a serious amateur. Other L series lenses owned is the 135mm f 2.o. This lens is really wide! I've been using the kit 18-55 and didn't think 2mm would make that big of a difference but it does. The pictures are sharp, with the corners being a bit soft.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Low light performance, Rugged, Strong Construction
Excerpt: I bought this for architectural photography and it has been absolutely worth it. I debated a less expensive off brand and am very glad I went with this. It's solidly built but not extremely heavy and very dependable.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Strong Construction
Excerpt: I could bring myself to give it 5 stars because of its still somewhat soft in the corners, albeit significantly better than it's little brother (17-40L). Image Quality is excellent! Tack sharp in the center with good sharpness in the corners. 2.8 is very sharp. Saturation, and contrast is excellent. Focusing is buttery smooth and fast. I love shooting architecture, landscapes and creative portrait photography with it.
Pros: Consistent Output, Durable, Fast / accurate auto-focus, Nice Bokeh, Sharp Open Wide