HQ can be very useful to create realistic looking grain. Sony high ISO images were similar to Nikon but without as much pointillism and more smeared noise reduction. The pointillism is not a bad effect, it’s very similar to what Nikon did to lead all the camera manufacturers in good looking high ISO images for about twelve years from the release of the D700, until the R5/R6 came out a couple of years ago and Canon finally caught up.
HQ is not like that, HQ will create pointillism even on low ISO image. It’s not a terrible idea as DeepPrime seems to have the good sense not to add much noise reduction when there isn’t much noise. Some people enable DeepPrime on everything. DeepPrime was quite enough and is very fast on modern hardware.
DeepPrime XD is aggressive and creates artificial detail.
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