5DMk2 vs OM-D High ISO Test

I aslo thought it a well done comparison, but remember that the Canon 5D Mk II was released on September 17, 2008, a veritable lifetime ago in digital camera terms.  And it's never had a particularly wonderful sensor to begin as at the higher ISO values it introduces banding issues when lifting shadows (weak DR?), similar to when you try to add a certain about of EV in LR on a camera like the Panasonic G3/GX1.

As far as DOF, I won't rehash the tired shallow DOF arguments, but it should be pointed out that while m43 had deeper DOF at any given aperture, there is a flip side where the higher pixel densities of the smaller m43 sensor means it's diffraction limited much earlier than a FF camera.  So in situations where you need tons of DOF, macro photography for example, it's conceivable that by f5.6 or f8 you'll already be shooting at diffraction limited apertures on the EM5.  This will of course not be the case in FF, but of course anyone does a lot of macro work knows that f8 is not going to get it done at such high magnifications on FF (nor is f5.6 on m43) where front to back focus is needed.  So there are trade-offs with any system, but the DOF equivalency argument is much more complicated when you start talking about pixel densities, diffraction, etc.