Central sharpness is very good at f/1.8 and f/2, excellent from f/2.8 through ... The taller the column, the better the lens performance. CA (Chromatic Aberration) is measured with any in-camera ...

Canon has a few years of development behind the system, but there are still lenses only available in EF mount. And while we've seen a spattering of lenses from third parties, including autofocus ...