One thing that has not been mentioned is sensor cleaning. I assume cleaning a mirrorless sensor is much easier than a DSLR. Occasionally one does have to do a 'wet' clean of the sensor.
Having cleaned the sensor of my old Canons and my new Sony A7r II, the complication is the same:
- Canon 5D Mark II. Activate the sensor cleaning mode, by leaving the mirror up, clean the sensor (yes, being more depth, it is easier to touch with the stick one of the walls of the sensor chamber).
- Sony A7r II. Go to the menus, activate sensor cleaning, so it vibrates to remove dust, and then, without turning off the camera, clean it. Since in this way the IBIS is locked and you don't damage it by applying to much force...
I read somewhere that the Nikon Zs also have some point where you lock the sensor IBIS for cleaning.
In other point, not having a mirror in front of it and being the sensor on all the time, it attracts more dust, but, at the same time, since it does not have a mirror, I always have in my bag a blower, each two days or so I just blow the sensor... after nearly one year, it has been quite clean... only moments needed for wet cleaning it is when some stuck dust spot... small ones that you see at f16 or higher... (same with my A7 II that I have for nearly two years... but not very used lately...)