A question for the 5D owners/users:
How well do the pictures turn out on the 5D, when shot indoors (low light), and without flash ? With the 24-70 f2.8L (or 16-35 f2.8L) lens ? This is important, since in certain situations, without the in-built flash, low-light non-noisy performance would be needed.
I posed this question in the other 5D thread but possibly got ignored in the midst of other more pressing issues.
On a different note, I wish there was a 24-120 f2.8L with IS, available from Canon, even though it would weigh quite a bit. For most of my activities, I would not need any other lens, specifically when mounted on the 5D (FF).
It performs better than the 20D. I used the 5D with a 50mm f/1.4 at a Christmas party with better than expected results. The larger pixels of the 5D sensor definitely have an effect. I used the camera at 1600 and 3200 (ISO expansion) and even had to "push" some 3200 shots 1 stop. In all cases the noise levels are low and I'd have no problems making 16x20s out of many of them.
At one point I accidentally under-exposed an image 3-stops (oops) but was able to recover it better than I have been able to recover 20D shots shot -2 stops under. I was at ISO 100 coming out of a studio which may have had an effect on that...
I want to say I almost had one extra stop of noise performance vs a 20D (i.e. 20D @ 800 = 5D @ 1600) but I'd need to use one more to say anything definite.
Attached is an image taken at ISO 3200, 1/60, f/2.8 with -.20EC in ACR. No noise reduction with capture sharpening in PK. Also attached is a 100px PNG of the original image just in front of the guys eye at 100% zoom.