There are many non IS lenses that it would be great to have IBIS. Think FD, FL and R lenses and hundreds of other Non-IS lenses. If the lens has IS that is not required but for all other lenses this would be huge and make using them far more enjoyable, especially older telephoto lenses including many EF lenses and even some RF lenses without IS like the 28-70, the 50mm f1.2 and 85mm f1.2.IBIS is overrated.
Compare camera shake with a non-stabilised tele or macro, on a 5DMkiv, and on a R5, and you won't notice much difference.
Yes, I have both bodies and have made multiple comparison tests using stabilised and non-stabilised Canon glass.
You'll see an improvement in stabilisation if you use short focal length lenses, but with teles nearly all of the stabilisation is done with the lens, not the body.
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