I agree; the 5D3 is an awesome camera. Everything about it is a pleasure to use.
I had the 7D before (and still have it, in fact), and that felt like a luxury item (and it is).
But the 5D3 feels like a whole step above that, even.
Amazing! And yes, I have it permanently set on "Silent shutter".
And the fact that ISO 12800 is at least as usable as ISO 1600 on the 7D is also very satisfying. There is some loss of resolution at that level, but the noise is very inoffensive, and IMO, the pictures are indeed still very usable.
I am very pleased I splashed out the £££ on it!