Haven't read you saying you sold one 5D2 for 2 7D
That is because I didn't say that
Why I want to know what do you shoot at 1200mm f/8 ISO 400 with flash? Well because I'm really curious about this combination and really what kind of pictures would you ever want to take with such a setup.
Still today Canon guys told me about the f/8 focus and the way focus works, they preferred to do it this way because an f/8 sensor is bigger than an f/5.6 thus they wouldn't have been able with the actual technology to stuff so many focus points on the sensor.
What kind of pictures would you take with AF at f/8 1200mm BTW? A 600mm is quite a heavy lens so you'd probably use it on a gimbal head, to subject that don't move too much, so there's the chance you could still use manual focus
Birds in flight, no chance for manual focus
You seem also not clear about what do you want: do you want speed? Do you want quality? Do you want full frame or crop? What kind of pictures do you take mainly?
Also final thing since you seem blind at the graphs on DxO I'll post them here so you can see how 5D2 has better IQ than Ds3 (as also the canon representative said and like lot of people and tests can confirm).
Well the 1ds3 scores higher than the 5D2 in everything except the high iso. The 1ds3 is a far better camera than the 5D2 in more than IQ
Why would you use the 1Ds3 in low light when you have a 1D4?
I take pictures in low light - but with iso no higher than 400
I also take pictures with the 1D4 in low light with the iso up to 1600 - although sometimes higher if needed for the shot
This underlines that you haven't understood that FF cameras perform better in low light: a 1Ds3, a 5D2 or 5D3 are surely better than a 1D4 in low light-high ISO situation.
Here your tests where you can see how 1Ds3 is not better than 5D2: as you can see the 1Ds3 has more dynamic range than the 5D2 only at 100ISO, after that the 5D2 beats the 1Ds...beside the fact the difference at 100ISO is really marginal. This is why you shouldn't look only at the final numbers but at the whole graph.
I think you are talking rubbish - you clearly dont understand my comments and constantly misquote/ misunderstand/misread what I am saying