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Where does the A7r II / A7S fit in with this? Are they considered a prosumer version of this camera? And if so, what makes this more professional, the FPS?

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Yes, the A7 models seem to be more geared for prosumers or non-sports/wildlife professionals (e.g., for portraits I'd still lean towards the A7Rii).

The A9 is more "professional" because of its dual memory card slots, supposedly much better AF, FPS, battery life, and controls (joystick).

Not an exact parallel but I see the A7R as the MD Mark III and the a9 as the 1DX.

That's interesting considering so many professionals use the Mark III. I recall seeing an article that the NYTimes staff all used Mark II's at one point.

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