We will compare the EF-S 10-22mm f/3.5-4.5 USM with its Nikon equivalent: the Nikon AF-S DX Nikkor 10-24mm f/3.5-4.5G EDBoth lenses manage to keep the distortion lowThe Nikon lens is a little sharper and has a more homogenous resolution than the CanonBut the 10-22mm has a small advantage in term of Chromatic Aberration, especially in the corners at 10mmThe Nikon controls its vignetting better at F/3.5If we look at their landscape Use Case scores, for which they are made, the EF-S 10-22mm f/3.5-4.5 USM wins with an excellent 4.5 stars where the Nikon AF-S DX Nikkor 10-24mm