Finally shot the fashion show which I felt I somewhat needed the A9's.
A 24-70 was too short to get a nice blurred background walking shot towards me
A 70-200 was too longer to capture their end of catwalk pose
Depending on the height of the person the end of catwalk pose (and those who stopped short) lingered around the 60-80mm mark.
And the ~half-way catwalk photo was about 180-200mm
So it was a case of swapping between cameras every few seconds to capture a walking down the catwalk and end pose, sometimes the next girl was already too close behind to capture the walk - but I did what I could when I could.
The A9 was always locking, following and capturing several images of the subject in the quick second I raise the camera to do so.
The quality of the photos is beautiful too, they look so damn good!
I had another photographer helping me who mostly use the A99 and from a quick preview, the A9 seemingly demolished it in AF and Image Quality
and of course buffer was king