Camera Conspiracies: Canon EOS R vs Olympus EM1 Mark III: M4/3 Beats FULL FRAME for Video?

Camera Conspiracies writes:

Canon EOS R with RF 15-35mm f2.8 vs Olympus EM1 Mark III with Leica 12mm f1.4. Now that Olympus has phase detection, is it as good as Canon’s dual pixel autofocus in video? There are levels to phase detection autofocus, some more polished than others. Can Canon compete with Olympus stabilization? Lens + digital vs IBIS + digital.