. . . again.
Out with the Z fc and 500mm PF in the afternoon, after shooting several times with the D7500, it seems that the mirrorless body is more to my liking. It’s just as fast and a bit more sure with AF; and the EVF is actually easier to use than the D7500’s tiny OVF.
The thing that cinched it, though, was shooting a very distant critter friend, one that fit inside the “single point” focusing square. Where the D7500 would hunt back and forth, the Z fc nailed it. IIRC, it’s the first camera I’ve seen since the D700 that has true single point AF (and actually a dot in the middle of the square) while using AF-C.
Still in limbo, though, until the Canon stuff comes back, although the reviews I’m seeing for the Z 100-400mm look really positive . . .