Here is the screenshot comparison I download from dpreview. Canon 5DMIII JPEG ISO6400 vs Olympus OMD -EM5 JPEG ISO3200
Why vs OMD ISO3200 ? Because OMD has 5 axis IS, which claim to have at least 3 EV stop IS. In fact, to lower down from ISO6400 to ISO3200 is only 1 EV stop. never mind, we take more conservative approach. To me, Oly OMD does not perform worse than Canon 5D MIII in term of noise. and OMD preserve more detail.
Head to head, OMD is a winner here. If u factor that Canon 5D MIII is FF, and OMD is m4/3 sensor, then it is obvious answer. Some more it comes with titl LCD, weather shield, award winning wave front filter, 1.44m EVF. Pair with 12-50mm, the AF is as fast as DSLR. and this is less than SGD1.8K.