Let's not forget that 2K SDR content is graded at 100 Nits. Having most 4K HDR content graded to reach up to 1,000 Nits, which is 10x the brighter than the peak luminance of SDR content with the pure black that OLED and even the premium MiniLED TVs is plenty of contrast and peak luminance to deliver excellent images. 4,000 nits or 10,000 nits is beyond what our human visual system wants to see.
We can't resolve the F stops (Dynamic tonal range) to see any more contrast then if the content was graded to 1,000 nits. All the higher peak luminance would do if it was not tone mapped to the display's more reasonable peak luminance capability. Peak luminance above 1,000 nits when viewed in low ambient light actually looks annoying and can even feel uncomfortable.
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