The German Foto Magazin published in their August edition (available on Amazon) an interesting test comparing the IBIS of the Nikon Z7II with other mirrorless cameras. The Nikon Z7II was the best performer with perfect results up to 7 EV (they promised only up to 5 EV). Canon and Sony didn‘t reach their expectations. The Sony A9 camera actually looked disappointing (green=very good, yellow=good/OK, red=not sharp, click for larger view):
