9 out of 10 points and recommendedsuperwide, sharp, no distortion2999 USD, 1.1 kg
The canon 11-24 is world's widest ultra wide lens, the only rectilinear lens with a 90 degree in portrait format. - ideal for landscape, architecture or interiors. Assuming you own a 24-70 then all other wide angle zoom have a significant overlap in zoom range - however you need to cary almost the double compared to a 16-35.reviewed July 10th, 2015 (purchased for $3,000)
This lens is the closest lens for a human eye angle of view of 114 degrees - landscape picture especially if cropped to 16:9 look much more realistic compared to other lenses.
The lens is expensive, but if you work professionally then it's probably a must.
The only disadvantage is the fact that you cannot protect this lens with an additional filter.