Placebo effect.Don't know about consensus, but both Canon and physics agree that IBIS is of very limited benefit at long focal lengths. For example, the RF 100-400mm at 400mm delivers 5.5 stops of stabilization from the lens and gains a whopping 0.5 stops with an IBIS body for a total of 6 stops of stabilization. Maybe @CanonGrunt is experiencing psychosomatic benefit.
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