Quote Originally Posted by Busted Knuckles View Post
24-70 2.8 seems to be the winner
On EF, I definitely preferred the 24-70/2.8 II. Better IQ than the 24-105 MkI (I had two copies of that), and most importantly, better AF performance on a DSLR because of the wide aperture-requiring AF points.

For RF, if I had to pick just one, it would be the RF 24-70/2.8 IS.

Having said that, I started with the RF 24-105/4 and found the IQ to be equivalent to my EF 24-70/2.8 II. I liked the extra range, and f/2.8 on R bodies no longer adds AF functionality. I couldn't really justify owning both the 24-70/2.8 and the 24-105/4, but rather than swap for the latter for the former, I kept the 24-105 and added the 28-70/2 for indoor low light and portrait use. It's a beast of a lens, but balances well on the R3 with the E1 hand strap.