I have Canon and Fuji too. And I use the Canon 5.6/100-400 mm L IS II - with the fantastic macro-mode.
And if I compare, I am disappointed by the new Fuji, ist ist not shorter, not really lighter, has no gut close-focus distance / Image scale
and I can use my Canon on a 5DSR with 51 MP and have perfect stabilization until 1/125 sec freehand with 400 mm, or even at the 7DII at 600 mm.
So there is no reason why the Fuji should do better with Image stabilization in practice.
I will test it, but for me, I keep my Canon for tele-photography - Canon was for 25 years now ahead of all other lens makers in tele-lenses.
but I love my 2.0/90 mm and 1.2/56 mm Fujinon.