whumber
Mu-43 Top Veteran
Here is a good test of Nikon Z5 and Canon R5 IBIS. CIPA tests are 3-axis according to Thom Hogan. These guys got nowhere near the claimed IBIS performance, but more like 3-stops for 100 % accuracy.
This is the same issue that DPReview's methodology ran into before they stopped doing IBIS testing in their reviews, they did their measurements at very short subject distances which means translational movements become a much larger contributor to the camera shake and stabilization performance is substantially lower.