You can force 4:2:0 on PS4/ PS4 Pro combined with limited color space, as this is an option in the resolution section of the video settings in my previous post, when I listed all the PS4 settings available.
In this case, it should technically make the settings comparable to XB1. The only option we dont have is selecting the the color depth and forcing it to 10bit (only option is Off and Auto, Auto is needed for HDR), which may be the culprit behind the increased lag, but then again, I understand PS4 HDR is @ 10bit only?. The only downside to forcing 4:2:0 this is that you have to manually change back to RGB Limited for non-HDR titles.
I've been testing this for a few days now and the PQ is great. Its now an option of better/ brighter PQ in HDR with slightly increased input lag or a slightly more dimmed Game Mode HDR with better response. Titles like Days Gone pronounce the input lag in Standard HDR, as the response is already a little sluggish on Game Mode, so Standard HDR just makes it more noticeable and harder to aim.
As mentioned by yourself previously and the input lag testing device, I do think the actual input lag may be the same between Standard HDR as Game Mode at 21ms, as the actual input itself and initial responsiveness actually feels quiet similar, but once you start moving, you really feel it.
I'm getting a feeling the way Standard HDR handles motion may be the reason behind this input type feeling a little more "sluggish" and delayed when compared to Game mode, which people may be perceiving as greater lag, which in essence, is correct. There is defiantly a difference/ more sluggish feeling in input and i think the motion handling is the reason behind this, as I also understand, input lag instruments are measured by flashes on the screen rather than actual motion.
That's my take from using Standard HDR vs Game mode for a few days anyway...
