Sold my RF 24-105mm f/4L for the RF 28–70mm f/2L for use with my R5 and R6 and while it is a phenomenal lens, for me it was the wrong move.
Biggest con (after $$$) was size/weight. Definitely not a lens I wanted to walk around with on a daily basis and subject to damage or theft by frequently being carried around or left in a vehicle.
#2- Didn’t realize how much I would miss the 24-28mm range. A few mm makes a BIG difference on the wide end.
#3- Buyer’s remorse. After having it and realizing what I would/wouldn’t do with it Just no way for me to justify the cost. For those times I really needed the fast aperture, I have the RF 15-35mm f/2.8L (hard pressed to notice difference between f/2 and f/2.8 at 28mm),35mm f/1.8 prime, 50mm f/1.4 prime, and 70-200mm f/2.8L. So really a lot of overlap with my current lenses combined with the other negatives made it a short lived experiment. Thankfully I only lost $100 on the deal after selling it off.
In the end, I bought the RF 24-240mm and it is outstanding as a walk around lens. The RF 24-105mm f/4L is a great lens, and I will probably get another at some point, or maybe the 24-70mm f/2.8L but for now I am good without either and don’t miss the 28-70mm at all. Probably better fit to studio use or where the (to me) nearly insignificant IQ difference actually matters.