Originally posted by Winder K-1 and 31mm LTD is "no" its not fast enough. Neither is my A7II.
It would be interesting to take that side by side with a K-P. You know 24 MP like the A9, 7 FPS instead of 20. It would be interesting to find out exactly how much frame rate you need to get the shot.
Your comparison with the K-1 is a little mystifying. It's field camera, as described by it's manufacturer. So you describe an "people/action camera" with a field camera and say "the people /action camera is better for portraits."
I am quite interested in eye tracking and face detection, my Pentax XG-1 has an implementation of it, so I like the concept, just not the Pentax implementation. Complaining that your K-1 does't do what it was not designed to do? You ruined it, for me anyway.