Imagine that you had set up your camera inappropriately, and a day's worth of photos were captured at 10,000 ISO. Nothing about the subject matter would lead you to believe that 1/8000s shutter speeds were necessary. Nor was it temporally unique. Would you be disappointed in your carelessness and proceed to reshoot? Or could you publish sell, or submit them without any regrets?
If your camera is that good, maybe you don't need to worry about ISO. My own camera is pretty noisy at ISO 6400-- though this does depend on the lens, strangely enough.