When I first got my 5D3 I was blown away in the difference between it and 5D2.
I had gone to the photoplus expo in NY the day they released the 1DX and this was late October 2011 on a Friday afternoon.
No one knew what the 5D3 was going to be like.
So they had a sample 1DX there that you could pick up and try and the 14 FPS sounded like a machine gun.
It was amazing.
So I followed the release of the 5D3 and the day it was announced that thread was started that went on forever.
A few weeks later I had mine to go along with the 24-105 and 70-200 2.8 IS II
I felt like the 5D3 was worlds better in every respect.