I love my 5D4 and don't have plans for a mirrorless for years.
Do someone think there's a chance that Cannon makes a EF 24-70 2.8L with Image Stabilization??
I'm waiting since so long...
When Nikon brought out the 24-70 VR and given Sigma and Tamron have similar lenses I thought Canon would respond in EF mount but now I really am not sure.
I actually think Canon is serious that they will keep EF and RF mount going - both have different uses and the EF mount will be better in terms of balance for super telephotos etc.
Having said that I think an EF 24-70 2.8 L IS might be both bigger and risk being optically worse and I don't see Canon taking a backwards step. I think it's easy to forget just what an achievement the EF 24-70 2.8L II is - even after all these years it remains in terms of pure optical quality the best 24-70 2.8 anyone has ever built. Even the new Nikon Z 24-70 isn't quite as sharp (though controls flare better). The Sony GM 24-70 is a very sharp lens but actually bigger than the EF L. The Nikon 24-70 VR is enormous and a lot of reviewers seem to believe the optics got compromised (other disagree).
My point is that the 24-70 2.8 L II was an amazing design, a giant step forward, and is probably right on the limits of what is possible. To assume they can just stuff an IS unit in is perhaps mistaken.
Another example would be the Nikon 14-24 - again a lens design that set new standards. All these years later the only model that is stabilised to compete stops at 15mm. When Sigma went head to head with a 14-24 it ended up, despite all the years of tech improvement, very similar size and output. Nikon got it right that time and there doesn't appear, in SLR mounts, much further to go. I suspect the 24-70 2.8 L II might be in the same category.
Although I have doubts that it will happen perhaps one day canon will put IBIS in their SLR bodies.Sooner or later they might decide the technology is good and stable enough and indeed eventually more megapixels, more dynamic range etc etc will no longer sell bodies.