The ins and outs of this lens are probably well known to anyone interested in this review. This is a 15 year old design and among Canon's "smaller" white lenses it is the heaviest and most expensive. The 11x zoom range requires numerous optical trade-offs, and sometimes they are visible. With just one lens is the best you can get. The lens certainly lives up to its L designation and is a lot better than the other two all-in-one lenses: the EF 28-200mm USM (a 19-year-old design) and the EF 28-135mm. both of which are set. There is some distortion at the wide end, but that's not a huge disadvantage for me as I don't often find structure in the viewfinder when walking around with this lens. The sharpness over the entire zoom range is particularly impressive. On a recent trip I caught the neighbor's cat with 300mm and I have to say the lens is as sharp as a cat's moustache! The image sharpness is clearly supported by the image stabilization, since the picture was taken with a shutter speed of 1/250 second. The street scene should show that at 28mm you can see an object (here needles on a bush) at close range with a large aperture. I should also mention that the autofocus is pretty quick at the long end (at f/5.6), even in lighting conditions that the camera (in Auto ISO) recognizes as ISO 32,000! If you can afford it and are strong enough to carry it, then it's a great lens considering its inherent (small) limitations.