Weight: system more important than sensor size?

SergeyGreen wrote:

This looks like the worst example,

So I downloaded the RAW files from both, OM-D5 ISO1600 and D800 ISO 6400, in Adobe CR (whatever the latest is) downsized D800 to the size of 100% OM-D5, this is what I get,

Up-sampling OM-D5 to the size of D800 (going the other way) leaves noticeably more detail in the Nikon image. As expected. So what you see is simply more information in D800 file, which in turn makes it easier to clean and sharpen when needed.

One note, I think I said it many times already, Capture NX is what Nikon users should use (and most of them do), not Adobe. It is simply a better NEF converter than Adobe alternatives. I do not not know what it is for Olympus cameras.