I've discovered something about AF on the camera which I can't recall seeing here before, apologies if it's been covered.
Autofocus Impact of "Setting Effect ON | OFF": Menu > Cog > 2 > Live View Display...
When the Live View Display effect is ON, and light is suboptimal, and the lens is stopped down, AF can be somewhat slower to achieve focus because it is performing AF with the lens stopped down to the selected aperture.
When Live View Display effect is OFF, and light is suboptimal, AF will be faster, and depending on the aperture selected, noticeably faster, because the camera leaves the shutter as wide as possible (in poor light it will generally be wide open) while still presenting a consistent view in the finder(s).
This improved AF performance is probably why Live View Display effect defaults to OFF when the cameras are shipped new.
Since I've shut Auto Review off to get a more responsive camera, I prefer to have the Live View Display effect set to ON. The slightly slower AF performance seems like an ok price to pay.
I'm glad to have dug into this. When shooting in less than ideal light and/or wanting even more responsive AF I'll switch the settings around... this sounds like a good candidate for one of the memory modes on the camera.