As usual roger at lens rental has uploaded his video in which he completely dismantled a brand new canon DSLR to check how well built the camera is. In the conclusion he found that the weather sealing used in the camera is perhaps the best he’s ever seen in a DSLR.
Roger has this to say about the weather-sealing:
“So there you have it. This is, by dissection at least, the most thoroughly weather-sealed camera I’ve ever run across. (I would point out that I don’t take apart every camera so please don’t change my wording to say it’s the most weather sealed camera. I don’t know that.) But this isn’t just market-speak weather sealing. It’s a thorough and complete attempt to seal every possible crack and crevice the camera has.”