5DMk2 vs OM-D High ISO Test

When it was first introduced, I borrowed a 5D Mk3 and compared it to my 5D Mk2.  I found very little difference.  I agree, that there might have been another half stop or so of benefit in favor of the Mk3.  I ended up not buying the Mk3 because I didn't see enough of an improvement to warrant the cost.  Plus, it's even heavier.