When I sold my Canon gear a year ago, the one thing I missed was its outstanding flash capability. On full auto, it rendered consistently balanced, excellent exposures. As a friend put it, "Your flash photos don't look like flash photos."
When I went Fuji, I had a brief, disappointing affair with the EF-42.
I recently put my X-Pro2, 18-55, and my newish EF-X 500 in the hands of a relative with no experience. Full auto, bounce with diffuser, low white ceiling. I'm pretty impressed with the exposures. Shot RAW processed in LR.