I've tested this on X1X and lag is definitely higher than in Game Mode. Sorry mate but I think you just can't tell the difference. Only option to have low input lag in PC Mode is either worse than normal Game Mode or HDR Standard with banding (422).
EDIT: Easiest way to check it is to launch Destiny 2 in HDR. Then in controller setting choose sensitivity 10. By doing this I've noticed that even when selecting 422+8bit+PC HDR Standard lag is little higher than in Game Mode. Of course it's lower then 420+8bit+PC Mode.
This.
I've also tried various combinations on both PS4 and PC including the recommended 4:2:0 at 12bit (on pc) and both 4:2:2 and 4:2:0 set with limited on PS4 and HDR Standard always appears to be slightly more sluggish/ have higher lag than traditional game mode.
It might be because both PS4 and PC don't actually allow you to set 4:2:0 @ 10 bit exactly like XBOX, so we are never truely comparing like for like?
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