Image Stabilization
The Fujifilm X-H1 if the first X series camera to offer in-body stabilization, despite previous suggestions from the company that it couldn't be done. To get an idea of how well it compensates for real world hand shake, we ran it through our IS test at 24mm, 50mm and 200mm (equivalents).
Unlike other brands, Fujifilm doesn't gain an advantage when using in-body IS with a stabilized lens. In fact, the chart below shows that it is possible to get
better stabilization with non-IS lenses, than with their IS counterparts.
Stabilization is a complex issue at the best of times, with different types (and differing extent) of movement playing a different role, depending on focal length. In this case there's an additional complication because most XF lenses weren't designed to project the slightly oversized image circle needed for in-body stabilization to work to its full extent.

Fujifilm's own claims show that IS performance is somewhat lens dependent and that the provision of lens IS doesn't necessarily lead to better performance.
Just in case anyone is interested, on the strength of this DP Review I've been doing a few test myself with fully manual FF legacy lenses (all Nikon) and the following few bits came to light.
As stated above the wider XF lenses have a slightly oversize image circle and the longer lenses not so much so hence when one is fitted it tells the camera electronically what lens is fitted and this adjusts the amount of movement the sensor is allowed to make.
I wondered if fitting a legacy FF lens which obviously has a larger image circle and entering a lower focal length in the menu as apposed to the focal length being used would it affect the amount of stabilization obtained, as the camera wouldn't know exactly what focal length is fitted as there would be no electronic coupling.
So I mounted several different fully manual longer FF Nikon lenses to my X-H1 and my findings were as follows.
When I entered the true focal length ie 105mm, 135mm, 200mm, etc etc the image stabilization decreased visually the longer the lens, which to me means the camera was assuming there was an APS-C lens fitted that probably had a narrow image circle. But when I fitted the same lenses in turn and entered 14mm the image stabilization increased significantly which means the camera was assuming there was a short focal length APS-C lens fitted with a wider image circle. The resultant images were clearly sharper with no adverse effects that I could see to the rendering of the image ie distortions etc.
So my conclusion to this test would be if fitting a FF longer legacy lens to the X-H1 enter the correct aperture and a low focal length number and the stabilization will be significantly better than if you enter the true focal length.
George.