Sure, you're gonna hear that the "color science" is bad. Nonsense! I've matched my Gh4 with the BMC4K, C100, A7s, 5Dmk3, AX100 and more. I see the keyword "playing soccer" and "MMA fighter" and I think fast AF system. Sony A7,A7s, A7r is not the camera. And I own the A7s and A7r.
When I used the A7S briefly for stills after the A7R, I noticed that the A7S raw files had more muted colors and were also a bit greener (in Lightroom) at any given WB setting. It's kinda nice, vintage-y. I wonder if Sony did in fact tweak the "color science" of the A7S. Have you noticed this?