Very informative video!
Base PS4, external base-spec HDD:
Planet Z was pretty much fine, only one small piece of ground where rock texture didn't load in. Which is remarkable because that first visit goes on and on and up and down and across and everywhere across landscapes and natural and man-made materials, for hours.
Can confirm that the game overall appears to be higher-res, almost no shimmer and images maintain clarity. I know it's a different engine but with Titanfall 2 you could very visibly notice the resolution drops. I guess people don't remember this.
Then I went back to the first planet for some stuff, and that first half of it starting at the ship is still kinda rough in the stutter area. Nothing like the hard pauses in the video, but something's still off there. It's weird because this area of the game is not more special environment-wise, or larger, or more expansive than Planet Z is, at all.
On to the next planet, we'll see what happens.