Quote Originally Posted by Kayaker72 View Post

So, from above, you mention that IS was a primary reason for switching. I do think IS+IBIS is better, but maybe only ~1 stop. If you still have your EF 24-70 II, you might want to try IBIS only (making sure it is on, Picture/camera tab 7, mine was off when I received it). Or maybe the sharpness at 50-70 mm is noticeable? I'd be interested if it is.
Initially the difference I see are so subtle that it might not be worthwhile for most people. The 24-70 II is going for about $1300 used, and it is an extra $1100 plus tax to switch.

The RF version actually feels a bit larger on the camera than the EF version with adapter even thought it is not. Size is a wash.
Looking at Bryans image charts I am not seeing much difference in IQ. Keeping in mind all the comparisons are either higher resolution or lower.
From what I have seen so far they are about equal as far as sharpness all the way through. I would have to set up some home made tests to compare.

Honestly it is a questionable upgrade for most people.