Over at the ClubSnap forum (more images can be found there), we can already see the examples from both D4 and D4s at all ISO values. The D4s looks at least one stop better, and shows much less color noise. Since 204,800 is rarely used, here’s another example at ISO 51,200.
These photographs were taken in relatively good lighting conditions, so you can expect the performance to be a bit worse in low light. However, the D4s looks usable (keep in mind these are 100% crops), and will probably be great at ISO 25,600 no matter where you are shooting at.
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