I really should use more smileys ^_^ I was pretending to be a simple minded marketing guy, but no, again, they take it serious :lol:
Sigma uses seals, just only in their sports edition. You know, I always said this rubber gaskets round the bayonet don't do a super reliable trick, especially because I nowhere found a real warranty in which Nikon says "half an hour rain of not more than 50 liter per m<sup>2</sup>
is alright, just not more than twice a day". Therefore i'm not less careful with the lenses you guys think it's sealed.
There are standards for sealing electrical parts, like IP57, IP68. I'm sorry, I simply cannot see a reason why camera manufacturers get away with this "some sort of sealing" - exceptions like Pentax and Olympus don't need to rely on myths, they actually show wet lenses and bodies in their advertisements and would get in trouble if they's lie there.
You will not find an official picture of a wet Nikon on their website...
Oh and since we're a "throw away society" - you get two Sigmas for one Canon.
Oh 2: if you would have shot "tits in a studio", you maybe would have come up with a solution for unsealed lenses: