The following is a ISO 25,600 sample set comparing the new Nikon D800 with some professional camera oldies but goodies: the Canon 1DMKIV(circa 2009), the legendary Canon 5DMKII (circa 2009) and just for fun, the consumer Nikon D7000 (circa 2010). Look for yourself at the 4 sample RAW files shown. These images are straight out of camera, shot under the same 98CRI daylight lamp, with equivalent prime lenses.
I'm rather shocked at how noisy the file is. The new Canon 5DMKIII will easily blow the Nikon D800 away in high ISO performance.
Not to beat up on Nikon, but they have a tendency to include ISO ranges on their cameras that are not realistic for the camera to achieve while providing good image quality and dynamic range. I would not consider this a usable image. High ISO isn't as great as it's marketing out to be, folks, so don't believe everything you see. It's also driven by Megapixel Mania, out of control IMO. Image courtesy of dpreview.com 
I'm rather shocked at how noisy the file is. The new Canon 5DMKIII will easily blow the Nikon D800 away in high ISO performance.
Not to beat up on Nikon, but they have a tendency to include ISO ranges on their cameras that are not realistic for the camera to achieve while providing good image quality and dynamic range. I would not consider this a usable image. High ISO isn't as great as it's marketing out to be, folks, so don't believe everything you see. It's also driven by Megapixel Mania, out of control IMO. Image courtesy of dpreview.com
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