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So………… It seems the thing people talk most about with cameras today is ISO performance. So here is some examples/tests of the D3s & 1D4 ISO perform
via Canon Rumors: http://www.canonrumors.com/2010/01/nikon-d3s-vs-canon-1d-mark-iv-iso/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+canonrumors%2Frss+%28Canon+Rumors%29
By the looks of things, Nikon’s D3s is definitely outperforming the Mark IV at high ISO.