I'd like to honestly be able to say one lens is sharper than another, between different systems, but I think this is pretty difficult, even when using raw. It seems pretty easy on a single body, I can switch between a kit lens and something a bit better like a moderately priced prime, say the Sigma 30. The difference is pretty apparent. However going between two systems, how do you guys do it? Say comparing a M43 lens to something on a DSLR. How do you factor out sharpening introduced by the camera and/or AA filter differences? Then compound the problem by sharpening in PP, I can make the cheaper lenses look nearly as good, true I have to use more sharpening for the same effect.