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I assume you ask the question because you can't or won't buy a second copy of your main camera (which would be preferable). With m4/3, and if you can live with f/4, the E-M1 II and Zuiko 12-100mm f/4 would be hard to beat plus a fast prime for ambient light, like the Zuiko 25mm f/1.2 or PL 42.5mm f/1.2. If you can't live with f/4, the Zuiko 12-40mm f/2.8 is nice, and the Zuiko 14-35mm f/2.0 in 4/3 mount with adapter (full functionality on the E-M1) even nicer.
Why don't you just buy a used A99 or A77 or even an A7 with adapter then? Operating two system has a lot of downsides, and the more components that can be shared, the better.
Up to last year, I also used an A99 for weddings. For a while my back-up was a A900. This was less than ideal because the flash shoe on the A900 was the old Minolta version, so the cameras couldn't share speed-lights (the adapter was simply to rickety and unstable).
