I had the Canon 7D as i wanted the crop and faster AF system compared too my 5D2 but i wasn't happy with the noise so i sold it within a month of owning it from new

Yet i find the OMD ( and GX1 ) good but maybe im just comparing them more too previous M43 models
I don't go too wild on high ISO as i tend too go for faster glass too try avoid doing so yet...
ISO 12800 with the OMD and a Olympus 45mm which isn't bad in my opinion, i messed the metering up with it having a Black cat i think hence high ISO
Dexter in high ISO !