OM-D and 12-60 w/adapter?

There are lots of threads about this combo; you should search for them. I've not tried the combination myself, but from what I've read: (a) the IQ is amazing, as you probably already know if you own the lens; (b) it's slow to focus compared to native m43 lenses. I would think that would be a problem at a wedding, but I'm not a pro so maybe not.