Thank you jd7. I personally find it to be a better lens for me. I don't miss 24mm at all. The 28-70 is tack sharp at f/2. It is the very best lens I have ever used so far. It is that good. I really did like the 24-70 II, a lot. A whole lot. It was also very sharp. In my opinion the sharpness and bokeh is better on the 28-70. Especially the bokeh and also the contrast to my eyes. I never look at MTF charts and wouldn't know how to read them if I did. But I sold the 24-70 to help with my switch to the R because of these new lenses and the hoped for better AF performance. So I never tried it on the R. To me, the R is a huge upgrade from the 5D Mark III I had AF wise, and the mega pixel bump is a big help too.
I don't regret switching at all. I'm still getting used to the touch and drag while looking through the viewfinder, but that may be a matter of fine tuning it that I have not figured out yet. In my opinion, if one gets the 28-70 there is no need to purchase a 35mm or 50mm unless one wants faster than f/2. I even struggled about whether or not I really need the RF 85mm f/1.2 or not since 70mm nearly gets there. But the 85 is so fast and I often need that in dark venues. I've read that it is also very sharp and quick at f/1.2. I can skip the RF 50mm. But I decided I do need the 85mm since I sold my 135 f/2, so ordered it tonight. It should be here Tuesday. Unfortunately, now I am out of things to sell. All my EF gear is gone, (along with two custom AR-15 rifles) and I'll be down to just the two lenses for quite some time now, except for my collection of old manual lenses. I'd sell them too, but eBay eats you alive with fees. However, everything was sold "Buy It Now" and it all sold in about 36 hours. I got good prices.
One thing is sure, if Canon produces an RF 70mm - say 135mm at f/2 I'd buy it ASAP. Or even a 135 f/1.8 or something. I really don't need anything longer than that for what I do and I'd be a happy camper for a long, long time. The RF 28-70? It is as near to perfect as I have ever seen.