Does it matter? CF never started as a pro format - they were pretty ubiquitous until makers decided to make electronics smaller still. The pro market kept CF as it was faster and able to store more. Being bigger and enclosed, they also give more confidence in their robustness. However, I've broken the odd camera, I've never broken a card. CF is easier to fumble in your pockets for, but capacities are so high now, how often do you need to? I'm not sure whether SD is quite as fast but unless you shoot motorsport, this becomes more academic each month.
However, if you are 60 miles north east of nowhere, your computer has packed up and you are on assignment, chances are you can buy, borrow, beg or steal an SD card from somewhere. CF is harder to find.