When bought for a cropped-frame body
Good points
Canon 'L' build and mechanical quality.
Effective IS and quick USM focusing.
Polariser-friendly internal focusing.
Compatible with full-frame bodies.
Bad points
Lacking wide-angle on cropped bodies.
Relatively expensive.
Fringing visible even on cropped-frame.
Less compelling if you're not going full-frame.
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Scores
(relative to other zooms)
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