The Canon 70-300mm F4L has an average review score of 86%

Score (%):
Canon EF 70-300mm f/4-5.6L IS USM
The Canon 70-300mm ?/4-5.6L IS USM didn't produce tack-sharp results, but it produced a consistently good images at each focal length, with good control of chromatic aberration
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92

Canon EF 70-300mm f/4-5.6 USM L IS
The Canon EF 70-300mm f/4-5.6 USM L IS shines when used on an APS-C DSLR. It is capable of delivering very high quality results throughout the entire zoom range and across the whole image field here
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80