I think a little hand cramping would be a decent side effect of prodigious imagine quality.
I'm with you. I would really like to know more about people being physically hurt from ergonomics.
I think a lot is down to age.
In exchange for wisdom one loses physical capacity.
E.g. When I was a student pre health and safety days: I did a hod carriers job (lifting bricks up ladders in a tray of 12 bricks and putting them out for the bricklayers ) 8.00 am till 6.00 - every day we lifted in excess of 17 tonnes per day. I was so fit: I would have laughed if someone told me the ergonomics of a camera could cause pain!
But over 55 now, 3 hours + into a shoot with a 70-300L onboard (total 2.2 kilos); if the camera isn't a good fit My hand is uncomfortable!
SAD to admit just a fact.
Hence I love my 7D and was not so keen on the Sony A 77.
I did change Brands more for the overall build quality and especially the L series Lenses but ergonomics were a significant factor.

