Gary,
nfortunately, for me, you have the old 'L' lens, which I have many good reports about.
Optically it is supposed to be better than the 17-35, and probably 16-35, L lenses.
I have the current non L USM which is still a very good lens for film but I don't know about for digital.
Cheers
Keith
I have or have had all of three. All of them have a strong vignetting, distortion and good sharpness. Perhaps the 20-35 had a little less distortion but IMHO the best is the 16-35. However none of them reach the level of quality of a good prime as to manufacture a excellent wide zoom is almost impossible, but are much more comfortable, and like me, if you are using a FF EOS the less changing the lenses the better.for the cleaning the sensor.
Felix
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