I think it is sort of stupid to take any piece of expensive electronics out in the "wet". Who knows what "weatherproof" means? It is not defined anywhere. If this stuff were indeed "rain proof" there would be a specification in the spec list telling you so. Something that reads like "Guaranteed to withstand rainfall at 1 inch per hour for 3 hours on any incident on any axis" or just simply something like "Designed for compliance with MIL-STD-883" or something like that. NONE of this stuff says anything like that so to assume that it is rain proof is taking a risk on your part, regardless of what the marketing glossy or folklore heresy says. The word “weatherproof” or “weather sealed” is meaningless w/o a specification.
Well, 6d isn't weather rated. Never had an issue with my 5d2/3 and 1Dx. I just spent a few days shooting surfing in LA, on the beach, in the rain/wind/seaspray and have no issues. Canon does rate their cameras as well, 5 series is rated for light rain and high humidity, while the 1 series can resist rain, humidity and all sorts of nastiness (1dx spent a night in 2ft of snow and worked fine). I will find the specifics and post them when I get home.