Okay, time for another useless but fun comparison. This time, I looked at the 1D4 vs the 1D3 at ISOs 3200 through 12800. ISO 1600 was so very close, it wasn't worth looking at.
Here is what I did to set the stage for the comparison images below.
1) Shot 3 images with the 1D3 at each ISO in raw, with high ISO NR set to ON
2) Shot 3 images with the 1D4 at each ISO in raw, with high ISO NR set to STANDARD
3) Used DPP on each image setting the same WB (see notes below on this), one time each where DPP honored the NR values from camera, and one where I set NR to zero.
Comparisons Below:
a) Difference in the metering systems between the two
b) Crops of each image with in-camera NR honored, where I resized the 1D4 down to match the 1D3
c) The 12800 shots post processed with Noiseware/Smart Sharpen for both
d) Crop comparisons of resulting JPG with NR turned off in NR, then different comparisons of resizing one to the other, and post processing results, etc.
Brief Observation:
These two are very similar to each other, but there is an edge given to the 1D4 due to the larger resolution that can be resized down, and it seems to be more even/controlled at the higher ISOs, where the 1D3 starts to show the blue blotchiness (which I saw on my previous 1D3). The metering on the 1D4 does better in CFL lighting, still not great, but there is a definite improvement, much like I saw with the 7D.
In any case, they are both very good, and if you weren't pixel-peeping, you may not even be able to tell. It is nice to see that the 1D4 does have an edge, and with the increased resolution even, so it is definitely more versatile at low light shooting with more cropping power.
I hope you enjoy this brief overview and let the discussions ensue!

















