Test and reviews:

Local:

Lens sharpness tests done by Marco with some lenses we own or owned including the EF17-40 f/4L USM, EF24-85 f/3.5-4.5 USM, EF28-80 f/3.5-5.6 III USM, EF28-105 f/3.5-4.5 USM, EF50 f/2.5 Compact Macro & EF70-200 f/4L USM
EF17-40 f/4L USM vs EF16-35 f/2.8L USM test copied from another site
EF17-35 f/2.8L USM vs EF16-35 f/2.8L USM test copied from another site
EF300 f/4L USM Review copied from another site

Links:

Canon 28-105 vs. Canon 28-135 sorry link was lost will try to find it again
Comparison of 3 Canon Mid-Range Lenses EF 28-105 f/3.5-4.5 USM, EF 28-135 f/3.5-5.6 IS USM & EF 28-70 f/2.8L USM
Comparison Test - 28-105, 28-135, 100-300  
Canon EF 28-135mm IS Lens Compared to Other Consumer Zoom Lenses Primes and Canon L-Zooms Includes EF24-85 f/3.5-4.5 USM and EF28-105 f/3.5-4.5 USM
Canon EOS 24-85 Lens Review  
Canon 24-85mm f/3.5-4.5 USM Lens Review The-Digital-Picture.com review for this small, light and inexpensive Canon zoom lens.
Canon EF 70-200mm f/4.0 L USM Telephoto Zoom Lens The-Digital-Picture.com review for the Canon EF 70-200mm f/4.0 L USM Telephoto Zoom Lens is arguably Canon's best value "L" Lens.

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