This page compares the Nikon D800 36-megapixel resolution to the Nikon D3s 12-megapixel resolution across the 100 - 12800 ISO range.
The lens was the Zeiss 50mm f/2 Makro-Planar at ƒ/8.
The previous page addresses the noise differences at various ISO values at an intermediate resolution. See the notes on that page regarding RAW file processing.
To both simulate a large print and to facilitate understanding the resolution differences, both images were upscaled to an arbitrary size of 9000 pixels wide, then given modest sharpening, somewhat less than would be ideal for a print, but enough to bring out the details suitable for screen viewing.
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