This Canon Zoom 24-70mm f/2.8 L USM is in excellent working order. Sharp and fast. Build like a tank. It has clean glas and a slight bend on the front edge. Comes with both original lens caps that fit well. The Canon EF 24-70mm f/2.8L USM Lens is an impressively high performing zoom lens. I regard it as one of the best general purpose lenses available and for the same reasons, it is one of the most-professionally-used Canon lenses. The 24-70 L is as good as it gets in this focal length range. The Canon EF 24-70mm f/2.8L USM Lens is a very sharp lens - few zoom lenses reach this level of sharpness. The 24-70 L is sharp in the center at f/2.8 at all focal lengths and performs well in the corners. Some corner softness is visible at the wide end of the focal length range and more softness is apparent in the 50-70mm corners. As usual, stopping down (selecting a narrower aperture) to f/5.6 makes a big difference in the longer focal length corners. The wide open 24mm corners are most-affected by vignetting. Vignetting is well controlled, but apparent in the corners at f/2.8 at 24mm on a full frame body. Vignetting improves as the focal length increases and the aperture is narrowed. At comparable apertures, the 24-70 L shows less vignetting than the also-excellent Canon EF 24-105mm f/4L IS USM Lens - a typically-expected result when comparing a fast lens to a slower lens. Color, contrast and saturation are excellent. CA (Chromatic Aberration) is well controlled - especially for a zoom lens. The wide 8-blade aperture produces a nice quality background blur and a nice amount of it. .