I just hope its pretty close to the 1dmk4 if not better.... I shoot alot of concerts, weddings, and sports.... This camera sounds like the holy grail... (to me at least)
useable iso 6400-12800 should be standard.
The 5D MK II is already better at high ISO than the 1D MK IV, so thats a safe bet. Full frame has a considerable advantage over crop sensors in low light.
How does that work??
5dII max ISO is 6400
1D4 max ISO is 12800
Have you looked at image samples?? 5D MK II is obviously better at high ISO's.
You can also check DXO's measurements of the sensor low light properties.
The difference in the two is the in-camera jpeg processing that the 1D can do with its dual processors, so jpeg images look pretty good, but if you use raw, the 5D MK II is much better due to the fact that the images get the same high level of processing.
The ISO setting on a camera is no indication of relative performance.
Even some point and shoot cameras can sometimes be set to ISO 6400, but that does not make them equal to a 5D MK II.