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Get the best zoom for the Canon you can, and, if you haven't already got one, borrow / hire a good quality (bright, quick recycling) flash, with a bounce / diffuser device. Don't bother with the prime - no one cares really, and the stress of trying to get good images with 1.4 will destroy any enjoyment you have of the wedding.
As others have said, use the Fuji for the informal stuff at the evening reception.
The big thing that I always got wrong was the backgrounds - put the gear on auto, and pay attention to the backgrounds, the framing, weird venue stuff (I photographed the bride coming through a door with a "Exit" sign above her head once).
I've got to shoot a wedding for friends next month. I'm not a professional photographer nor are they paying me a professional photographers fee so whilst I'm guessing that they aren't expecting premium images, id still like to do a good job. I've got a canon 6d with the 24-105 L and a 50mm 1.4. the 50mm is a bit soft and misses on autofocus quite a lot. It's a bit of a dud one as I've had the same lens before which was sharp and spot on.
I've also got a Fuji XT20 with the 27mm pancake and a small zoom lens, I forget which one. They like the filmy images I've taken with this.
My thinking is that the Fuji is a little small, whether or not it's fine for the job, big camera says "listen to my direction, I know what I'm doing" and the bigger files and low light performance of the canon would be better.
I'll take both but wondering what equipment I could need to do a better job. Thinking of maybe trying to get another 50 1.4 and hoping it's a better example or maybe a longer prime. Would I be better off just getting a prime for the fuji and doing the whole thing a bit more incognito? I'll also pick up a flash for the Fuji for the evening do I think