My 6d stood upto quite a few hours of rain before the rear buttons started malfunctioning, but it luckily never stopped working
I rice bowled it and after a day or so all seemed fine. Except one button at the back didn't recover. I took it to warranty with the, "I dunno?! This button won't work?" attitude and they replaced the rear board
I'm defo getting extended warranty.
At the time I read as much as I could find out about the 6d and didn't see anywhere any claim to its weatherproofness. Next time, i'll stay out in the rain but i'll wipe the water off the rear panel before it all builds up behind the buttons. I think the rear buttons aren't too water tight but the rest may be, dunno, shrug.
However, the 8-15 fisheye worked marvellously in the face of rain/seaspray. Not a single glitch.