Which is better in terms of sharpness and chromatic aberration, the Sigma 18-200 DC OS HSM or the Canon EF-S 18-200 IS kit lens? I've read reviews on both lenses on dslrgear and other sites, but i need practical user experience.
From this comparison I would say that the Canon is a better choice when considering CA and Sharpness. If you need practical advice - they both will do similarly and just fine for the uses for which they are designed. The Canon costs more, and for good reason. It does have higher grade optics.