D800 vs Olympus OM-D E-M5

Then the OM-D should be perfect.

NEX are too much like using computers for my taste. I like my cameras as analog as possible (ie M9 or dslr) and the OM-D does a pretty good job of that. It has separate dials for shutter speed and aperture and I assigned ISO to one of the fn buttons. Something else to think about is the huge lens selection for m/43. And then you can get cheap adapters (like i did for my leica glass) for using other lenses you may have or want to try out.

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Nikon D800 | Olympus OM-D E-M5