This page assesses noise in direct comparison to the Nikon D3x from ISO 100 through ISO 6400.
For comparison purposes, the D3x images were downsampled to D3s resolution using Photoshop Bicubic. This is done to directly address the question:
Here is the test scene below.
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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
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