I've never owned or used a .475, but I can confidently say that it will be no different than any of the other shells in the category. They all have the same effect.
The main difference I'm sure will be found in component availability.
Also, I had for some time, a .450 with hammers, and it's a very simple affair to cock them with complete silence, and it is much less noise than the click of a thumb safety. That is, if your safety makes noise. Other than that, I can't think of anything. It will simply preform like any other in the category, until one goes to a .500.