I still keep going back and forth, but lately I've noticed in some movies that using HDR Optimizer (disable DV) has produced better image for me. The DV in "It" and "It: Ch. 2" produced some scenes with raised black and blotchiness (and lit up the grey bars), while with DV Off it was inky black and perfection. While trying to troubleshoot my issues with Spectre, I noticed it also improved that.
I've been watching a lot of DV content lately and when I see an issue, I go back and disable DV and check again, and in most cases that issue didn't exist. Of course, that's a dumb non-scientific aproach since I haven't been checking for issues with HDR10/OptimiserOn nor really writing anything down...for example, DV with Terminator Dark Fate was much better than with it disabled (which seemed to trip out the HDMI and give a washed out image).
This is with Sony A9G (non-defeatable DTM) and low latency approach, and I have the Optimzer set to OLED of course.
My instinct prefers to use DV for the same "benefits" that Geoff explained, so I'm stuck! I feel like DV off and Optimizer on (for >1,000 nit content) gives me the most consistent image so far.
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