Well I got my RF70-200 yesterday and in truth I'm disappointed.
AF and image quality are great at close or reasonable distances.
Sadly, anything beyond about 100ft may or may not be in focus and anything beyond that is never in focus.
The image stabilisation is not as good as was hyped although that's a personal opinion.
I upgraded the lens firmware to the latest level but there was no improvement.
If anyone has this lens can I ask them to try focusing on for instance, a tree branch or lamp post head that is more than about 200ft away and let me know what happens?
FWIW I was using a single spot AF point.
I tried various AF cases all to no avail.
I also ruled out camera shake by using high if not maximum shutter speeds.
Also, the tripod mount is too large and short of removing it, it's always in the way.
I'll be doing more controlled testing this afternoon but my guess is I'll be returning it for a refund.