Nikon D3x vs. Canon 5D MKII: Image Noise

Source: prophotohome
High ISO Test Images:
All images were processed from raw at default raw converter settings with no additional changes. Please feel free to use the raw file downloads for making your own assessments in your preferred raw converter.
The Nikon images were shot using the Nikkor 85mm f/1.4 lens at f/1.8 using Auto White Balance.
All images below were shot with a single tungsten household light bulb. All Canon camera settings are identical using either the Canon 85mm (f/1.8 or f/1.2L) lens in aperture priority at f/1.8 or the Canon 50mm f/1.4 lens at f/1.8 with Auto White Balance on. A Gray ColorRight Target is included in the full raw file for setting white balance.(...More)