I was looking for a wide angle zoom lens for my EOS 6D and while the EF 16-35mm f/4L IS USM is not the most affordable option I feel like it's worth every penny. On the 20 megapixel sensor of the 6D it delivers sharpness at every focal length and every aperture from corner to corner. It also shows little to no chromatic aberrations and handles flare very well. All around a professional level lens that never lets you down.