I genuinely don't. I prefer most things about the Nikon, just the AF system isn't quite up to par and you can't get a proper grip. The Sonys are better performers (although I still can't gauge how good the A7RIV is and I'd want it to be
significantly better than the Z7) but I'm not a fan of the ergonomics, button placement or menus. They do have more native lenses, and the 61mp sensor could potentially mean I could use the 100-400mm as a wildlife/motorsport lens without
too much weight penalty (current wildlife setup is EM1-II and 100-400mm weight a total of 1559g vs 2060g for the A7RIV and 100-400mm)
As always it's a compromise and I'm probably falling foul of searching for the holy grail
Looking at the A7RIV specs fps is 10fps in Hi+ and 8fps in Hi, I'm guessing this means 10fps with slideshow view and 8fps with real time view? I see that the EVF has either 50hz or 100hz refresh rate, is that selectable or does it alter depending on shooting mode? I seem to recall that some of the EVF's reduce resolution or refresh rate if using burst mode or something?
What's the scan time of the sensor, is it prone to rolling shutter or is it like the A9?