It's a neat system for fine art repro. Do you cross polarize your lights/lens? Also, color consistency with lighting is essential. When I was in the business, I used Elinchrom monoblocks.
I think the EM5 II is an outstanding camera, and it is a viable alternative to PhaseOne and Hassey/Sinar multi-shot for copy work. The EM5 II's color fidelity is outstanding and the dynamic range exceeds medium format CCD technology. Canon, Sony, and Nikon are not good tools for repro. Trust me, I know. The sharpest Oly lens is the 75mm f/1.8. Second to that, the 45mm f/1.8. I hear that the 60mm macro lens is quite fine too.
A really great feature with the Oly is that it tethers to a computer. You can adjust everything from the computer--focus, f/stop, sync, white balance, etc.