Infamous is a shitshow on my X850D.
The first level in the guttery with Hank was a mess of pitch black areas and dim lights, and the cutscenes are even worse. Characters silhouettes just blend in with the near black backgrounds.
There certainly is no "pop" anywhere. Just harshly saturated colours and darkness.
Infamous is the game that prob shows what HDR can do most that i have seen yet. Its not about making colors pop etc, it never was. It's about accurate colours and shadows and highlight detail.
Infamous has a ton of lighting effects. It also has a lot of contrasting areas of light and dark. The reason some areas seem really dark is because they were meant to be but SDR cant display it without crushing all the detail so it gets brightened up a lot.
A good place i found to display it is in a tunnel (under a bridge). Its really dark in the tunnel and you can see bright light at the end. With HDR i have game brightness on max. Its very dark in that tunnel but you can still make out all the details (assuming the tv is set up correctly with no processing bs on). Switch HDR off and brightness to 3 and you will now see why everything looks darker in HDR. In SDR everything that is meant to be black is now a lighter gray colour. SDR can still display black (just look at the power bar in the bottom left) just not all the levels of black needed to not crush everything.
Essentially, when in SDR everything is lighter than it should be because it cant display the levels of colour and shadow it needs to. With HDR on it can and allows you to now experience truly dark areas rather than dark grey areas like you had before.
So yes infamous can be really dark at times but if you are seeing crushed blacks you have a setting on the tv causing it. For me i was pretty impressed with how much detail and how much closer to reality dark areas now looked rather than washed out dark grey like in SDR.
People seem to think HDR is about super saturated colours when its not that at all. Remember people, its about accurate, more realistic colours.