I’m an experienced wedding photographer who has wanted digital medium format for a long time. I use a pair of 1D Xs with the typical lenses that you would expect a wedding shooter to use. I never was intending on replacing my Canon gear, but rather supplementing it. My idea was use the medium format for location shooting, and use my Canon’s for everything else.

However I only really started thinking seriously about medium format in late 2014 when two things happened:
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https://petapixel.com/2015/06/29/review-the-pentax-645z-is-a-wedding-photographers-medium-format-dream/