You brought RED cameras into the discussion because they presumably don't offer in-camera image corrections. The cheapest RED camera is $6K. Obviously the R3 offers in-camera corrections.
Even more obviously, you are one person, not 'many people'.
View the image quality delivered by the Canon RF 15-30mm F4.5-6.3 IS STM Lens using ISO 12233 Resolution Chart lab test results. Compare the image quality of this lens with other lenses.