Do you really want the answer to that question?
I shot the K-5 vs the OMD on a back lit subject at ISO 3200 both. The K-5 had notably more shadow data, details, etc. while the EM5 sent them to crushed shadow mush. I may post the shots later. Oh and the K-5 did the same shot when there was a little less ambient light.
But to be frank, I think the IQ of the EM5 is quite good for a wide variety of situations and I think focusing on photography more than these differences is the way to go. If the EM5 didn't have the fast primes it would be a different story but it has them.
- Raist