Upload & Sell: On
Soon after I got mine I was out in the rain shooting a bike race, along with my 5D, which isn't sealed but I have had in horrible condition of rain and dust and it has done fine. On that day the 5DII fogged up and the LCD went out. The 5D, which received identical treatment was totally fine. I sent the 5DII in and told them what had happened and that it seemed the II had no weather sealing at all. The camera was repaired, the LCD replaced but I don't trust the camera like I thought I could. I just spent over a year in the second wettest place on earth and it did ok, though I did have to send it in once but it came back and this time, it seems to have weathered everything fine.
So there you go. In my experience, the 5D is as good as the 5DII in sealing, even though the 5D isn't weather sealed. The 7D also got a lot of rain in Micronesia and did just fine.