I received word from Sony and Canon this past week that I will have my hands on both cameras soon. I've seen the videos Ruggerpro is mentioning and I agree, it could be that the FX-9 AF has surpassed Canon's DPAF and that would be a good thing because DPAF is good, but it's not great.
EOS R has been updated with an AI type auto focus. Ir rarely, if ever, misses. Whether it makes it to the C500 MKII remains to be seen but I don't see any reason why it shouldn't.