Back and April Canon officially announced the Canon RF 400mm f/2.8L IS USM and the Canon RF 600mm f/4L IS USM telephoto lenses. Both of these lenses are basically a rework of their EF counterparts.
Gordon Laing was lucky enough to spend some quality time with these new lenses and gives us his impressions in the video above.
An interesting note about these new lenses Gordon mentions is that the native RF mount allows more power to get to the autofocus motors making them faster. By the sounds of it, this will be camera-dependent and will likely be available starting with the EOS R3.