I use a GH4 and love it.
For Christmas for me, I got a macro lens for it. I have taken one picture with it.
I was sick with a bug lately on top of the dentist doing some work.
I’ll turn it on some day.
I think the days of the SLR are numbered. With digital there is no longer a reason for that big mirror flipping up and down.
Also leaving that big mirror box off will make them more compact. Probably back to the size of the old 1930s era Leicas.