Make sure you watch this in 1080 HD mode to see the differences between these two cameras.
Overall it appears that the Nikon D4 is recording better fine detail. At 0:43 sec you will see some ugly moire from both cameras on the window blinds and on the roof shingles. ( wish there was a hacked GH-2 for comparison )
Canon 1D X vs. Nikon D4: Which one is better?
Many More Tests and Comparison on their YouTube Channel
Overall it appears that the Nikon D4 is recording better fine detail. At 0:43 sec you will see some ugly moire from both cameras on the window blinds and on the roof shingles. ( wish there was a hacked GH-2 for comparison )
Canon 1D X vs. Nikon D4: Which one is better?
Many More Tests and Comparison on their YouTube Channel