Artie, the best way to explain is look here
https://asia.olympus-imaging.com/pro.../feature2.html this shows the capabilities - quite incredible - a whole new world. So customisable and if you ever said, "I wish the 1DX did this", well almost certainly this camera does!
then from that link you can go to other various links showing various authors, accessories etc
My one and only reservation is that it is not good at high ISO, I have had some decent shots at ISO 6400 but that is pushing it. If any one does a lot of high ISO action then I would say this camera is not for you.
The design and finish and robust quality is second to none - even something as simple as the foot of the 300mm lens - it is an ARCA Swiss plate edge, the 300mm lens is razor sharp and the diddy 60mm macro well you've seen some results.