Canon RF 20mm F1.4 L VCM

Testers find it very sharp in the centre from f/1.4, with the edges only slightly behind and at their best from about f/4 to f/11. One test on a 45MP body found the corners close to the centre even wide open. Coma is well controlled, which makes it a good astrophotography lens, chromatic aberration is minor, and the bokeh is smoother than expected from a 20mm.

The trade-offs are a design that leans on digital correction: uncorrected raw files show heavy vignetting and barrel distortion, and in-camera distortion correction cannot be disabled. Flare results differ between tests, from well controlled into the sun to more flare and glare than expected around bright lights at f/1.4. Autofocus is fast and near silent, build and sealing are rated highly, and the main objection is the price. Having three ways to set the aperture was also seen as one too many.