Upload & Sell: On
Daan, what's your keeper rate with 5D2? I would expect for open air stuff as you described, 5D3's keeper rate would be excellent. For darker stuff, it should be largely improved. I have used mine for theater, outdoor events, animal images, and sports. It is very much like shooting a 7D for responsiveness & the servo AF is more reliable than 7D (which was already pretty decent).
I am also finding I need less sharpening, but I also upgraded to LR4. So who knows about that...
For me at least it has not felt like a WOW upgrade. I kept my 5D2 for a while to decide whether I wanted to keep 5D3 or not, and 5D3 has eventually grown on me due the overall performance of it.
Small sample from my first day with 5D3 doing some testing... I shot several sequences like this and every shot was in focus. Definitely way beyond anything my 5D2 could do, and 1D3 would often have some frames OOF.