As long as it's better than Witcher 3's, I'll be glad.
When I compare Witcher 3 with Horizon Zero Dawn, on PS4 Pro, it's quite nuts.
Although it's a current generation game, it's still a comparison. We can see, based on that current generation game, how much faster is the loading times. Even though next generation games will be heavier than that, it's still a technical comparison.
Witcher 3 should not be played on a console, and this goes especially so for people that like to utilize quick save. I almost missed out on the game because of this.