Aug 26, 2015
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You can see that all have their own disadvantages, either the size or the optical quality or the IS system itself.

So yes, they have waited until they could do one for the new mount, that is not too big while also being optically better than the EF 24-70 2.8 II
All the other FF mirrorless competitors (Nikon, Panasonic, Sigma, Sony) have decided to leave out IS from their 24-70mm f/2.8 lenses and rely on IBIS instead, which suggests that it isn't easy to do.
 
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