The Canon EF 20mm f/2.8 USM is a fairly large lens, but also fairly light at just about one pound with lens shade (not supplied with the lens).
Prime lenses (fixed focal length) can be better performers than zooms because they can be optimized for just one focal length. That is, if they are optimized, as opposed to a lackluster design.
The field test on the following page shows that the 20/2.8 delivers murky somewhat better results than the Canon EF 16-35mm f/2.8L II, depending on where in the frame one compares, and the focusing distance.
Performance of this lens is marginal compared to the Zeiss 21mm f/2.8 Distagon, as might be expected, since it costs 1/4 the price.
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