nice!...how do the PC graphics compare to Hellblade: Senua's Sacrifice?
More visual effects. Senua's Sacrifice did plenty to create a sense of psychosis, but its Celtic setting limited how far Ninja Theory could go with it. Bloober Team's cyberpunk Krakow is untethered by such limitations. They really throw the entire kitchen sink at the player as far as visual effects go. It's continuously impressive so far.
The models, while good, have nowhere near the fidelity that Senua did in her performance. And the lip syncing in Observer is pretty poor overall. Luckily, it's pretty rare that you'll encounter characters face to face.
Environmentally, however, the game is stunning, and the dream sequences so far remind me of the indie game Naissancee with its wild structures and constant reinvention. Senua's Sacrifice, despite having incredible detail in its textures, didn't build its world for players to mind the details. It's not a game where you'll obsess over a certain object places conspicuously in a room. Observer is that. They've paid attention to making sure each room feels lived in and has certain key items or secrets that tell you more about the inhabitants and their world.
Also Observer runs better on my rig than Hellblade, but that makes sense since its not aiming for photorealism.
EDIT: For those asking about if they should get this game if they hate horror. No. It's definitely terrifying. But there are very few sequences where you can die/fail, so I'm soldiering on. I can do scary as long as it isn't too gratuitous or too much "hide from the horror" gameplay.