I'm glad I'm not as picky as some people here about portable audio. I respect that level of commitment, but I suspect much dissatisfaction comes with it, because phone manufacturers are going to be aiming to please mainstream users, not audiophiles.
+1000
I'm glad I did not read this thread before I got my 6s.
Despite all the angst here, it is still the smartphone experience I've ever had with audio. And I had to overcome a lot of Apple hate to even buy it!