Ander167: I'm in Chapter 1 and just finished the Kayran fight. I'm pretty sure I'm going to switch to the Kayran armor, but it seems like it was strange for cd projekt red to carry that armor over and replace it so quickly. I'm not missing anything special about the kayran armor, am I?
I don't think there's any practical improvement from migrating from the Raven to the Kayran armor if you've filled all the runeslots.
Keep in mind that you tend to get big armor/weapon upgrades between Acts, rather than within each Act (ie: you can work your butt off for something within an Act and then find it almost immediately replaced with something in the next Act), if you're on the fence about it.
If you didn't import, then there's very clear progression throughout Act 1, but that's a whole other story.