You said “made for iPhone” - but sadly, I don’t think that means that an iPhone will stream directly to the KS-8s.
I think it just means that you can control things like volume, program selection, and directional microphones from the iPhone - as I do with my KS-7s from an Android phone right now.
Reading the KS-8 specs, I get deva-vu … they look just like the KS-7s. I need to get the spec sheets and do a side-by-side comparison.