I don't want to rain on your parade, but that's debatable in the IQ of 5D catching the IQ of a D3.^because it was cheaper way to upgrade.
D3 body and a lens would've been about 8g..
but for me. 5D + 2 lenses + a flash ended up less than 6g..
5D is not as fast or have iso advantage as D3
but all i need was quality and 5D can catch up with D3 easily..
it's my last time switchin brands.. I have to stick with Canon from now for sure.