Hi, Having recently bought the EOS 16-35mm f2.8 L lens we can state quite clearly that it really is a great improvement over the 17-35mm f2.8 L lens. Just about everything, from image quality to the build quality is better and the 16-35mm f2.8 L lens has fast become our favourite lens, by a long way. We just shot some family candids on this lens and also on the 50mm f1.4 and there's little to choose between the images, although the 16-35mm f2.8 L lens seems to give richer colours. Only you can decide if it's worth changing. If it were our decision then we would change to the 16-35mm f2.8 L without any hesitation, even if we had the 17-35mm f2.8 L. Hope this helps. Dave & Caroline UK
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