Comparison of 3 Canon lenses at 24mm
Camera: Canon EOS 5D 12.6 megapixels
Exposure: ISO 1600, f3.5 1/40

24-85mm f3.5-4.5 @ 24mm

Canon 24-85mm f3.5-4.5 zoom at 24mm , full frame

20-35 f2.8L full frame

Canon 20-35mm f2.8 zoom at 24mm, full frame

Canon 24mm f2.0 , full frame

Canon 24mm f2.8 prime, full frame

100% crop center

Canon 24-85mm f3.5-4.5 zoom at 24mm , Center, 100% crop

center 100% crop

Canon 20-35mm f2.8L zoom at 24mm, center 100% crop

center 100% crop

Canon 24mm f2.8 prime, center 100% crop

corner 100% crop

Canon 24-85mm f3.5-4.5 zoom at 24mm , lower left corner, 100% crop

corner 100% crop

Canon 20-35mm f2.8L zoom at 24mm, lower left corner 100% crop

corner 100% crop

Canon 24mm f2.8 prime, lower left corner 100% crop