Olympus OMd or A77?

After last my topic i had decided for an a77 also it has similar noise then my old a700.

But i saw an olympus Omd video into youtube and i love this reflex .

I do weddings and rarely use the reflex with big lens as 70-200 . I use mainly primes as 30mm 2.8 and 50mm 1.8 for portraits with a 10-20 sigma for group people (Some time i do everything with 30mm) .

Can i buy this m4/3 camera?

What lense can give me the same photo?