Effective fps with AF is an example. It's 3fps in focus priority mode, 5 fps in release priority mode. The 6DII's AF can theoretically perform both modes at 6.5fps, provided the conditions are right (luminosity, the lens' AF speed, etc.).
But these are just spec numbers anyway. We'll see exactly how it turns out in real life. Just don't expect miracles in continuous drive / AF (for example I doubt that we'll get a liveview feed in continuous drive mode, and that is going to be a lot more problematic than 1fps more or less here and there).
I just go with my experience that Canon marketing specs are overstated by about the same margin for different cameras. So unless proven otherwise, I take the difference between "theoretical" 6.5 fps on 6D II vs. "theoretical" 5 fps on EOS R to match the performance difference in real life.
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