At 17mm, central sharpness is outstanding from f/2.8 through to f/8 ... CA (Chromatic Aberration) is measured with any in-camera corrections switched off, as far as we can know anyway.

Canon's newest, non-extending 70-200mm F2.8 L zoom for RF-mount includes features aimed at both photo and video shooters. It also works with Canon's RF-mount 1.4x and 2x teleconverters.