Image quality test results have been added to the Canon RF 800mm F11 IS STM Lens Review page.
Here is the Canon RF 800mm F11 IS STM Lens compared to the Canon RF 600mm F11 IS STM Lens.
We have not tested the Canon EF 800mm f/5.6L IS USM Lens on the Canon EOS 5Ds R, so some discernment is required in the Canon RF 800mm F11 IS STM Lens vs. the Canon EF 800mm f/5.6L IS USM Lens comparison.
Keep in mind that results from a lower resolution camera such as the Canon EOS R6 will show less sharpness degradation from diffraction.
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