"In this case" sony is better because they are making the same featured body at almost half the price. and they are willing to share the mount specs to third party so that they can manufacture the adapters. The later aspect is more important than the first one. I am not saying that sony is better in terms of ruggedness or anything but at least I wont be paying premium for something that is clearly not provided. When chose the 5dmk3 the most important reason was that it was rugged use. I chose that camera so that I wont have to worry about the camera while traveling and taking pictures. If taking care of the equipment is inevitable why pay a premium? I would buy 5 sony A7 kits which retail for 1100 dollars instead of 1 canon camera which costs 5.5k?? 1 horse sized duck vs 100 duck sized horses.. get the drift?And since you were praising sony, how much does an Xperia Z's touchscreen cost?
btw, Sony has many more features compared to canons and Nikon. now if you want to argue about the picture quality... nikon uses sony image sensors and companies like lieca, ziess and voigtlander make much better lenses than canon. And the biggest thing is that you can use those lenses on Sony.
I am not disputing the fact that they are not splash proof. but The kind of environments the professional photographers take these cameras is very well known. When someone claims that the product is made for rugged usage, they should also make it repairable.
I am not making a statement that Sony is better in general, but in the camera scene, it is clearly disrupting the market monopoly.