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Once the IS has stabilized/settled (it takes a second or so, depending on which generation it is), AFAIK there is no drawback in IQ from using it.
The IS is in fact a glass element and it is always there, regardless of the fact that the stabilization is on or off.
What might happen is that if you take the shot before the image is fully stabilized, the motion from it (the IS is a floating glass element that moves) might actually be even greater than the motion induced from hand holding the camera.
Also, if shooting a moving object with 4 axis IS engaged, when you try to follow the subject the IS will try to counteract the movement (remember, the IS job is to keep the image steady...). In that case, it might be counterproductive to have 4 axis IS on, since it will also make tracking the subject (keeping the AF point steady in the subject) much harder. That is why most IS systems have two modes, where in one the horizontal axis stabilization is disconnected.
Hope this helps.
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