If Canon really wants to troll everyone, 20fps will be animated GIF only.We do not know what the 20fps is right? That might be jpeg only.
Why? Every digital photo camera shoots RAW at any frame rate. They may record the results in lossy compressed formats if the recording medium is not fast enough, but in these particular cameras, that's what the frame buffer is for.I would be very surprised if the Mark III can shoot RAW at 20fps.