So hear me out. I'm only talking from my own perspective right now but I'm not a fan of focus by wire, feel the lenses are way heavier than their EF counterparts even with the adapter and when comparing L lenses they're just as sharp on an R body other than the 50 1.2
On the subject of the RF50 it's staggeringly sharp, but massive at the same time and doesn't have the softer more organic look of the EF50 which doesn't have the back focusing issues once on the R.
The 85 1.2 is frikking massive again and we have a great EF 1.4
The 28-70 is awesome but HUGE and heavy.
The RF35 while having a nice macro feature can't seem to acquire focus at distance in low contrast and the STM hunts lots in servo when the EF 35 F2 IS nails it always.
It's almost as if in the pursuit of being different Canon went too far and stepped backwards...other than in the IQ department which is def improved but only for pixel peeping?
I understand where you are coming from. For me, if I bought into the R system at the moment, the only RF lens I might actually buy is the RF 24-105. Taking into account price, weight, size, and what you can get for your money with an EF lens, I wouldn't buy any of the others. I have to admit the RF 28-70 does catch my eye, but I am not interested in paying the current asking price for it. Of course, I'm not saying the RF lenses aren't good - clearly they are, and the RF 85 has substantially better CA control than any other fast 85mm lens I've seen (interested to know if anyone else has seen another 85mm which is comparable). All I'm saying is that, for me, when I look at what I can get with Canon EF lenses and third party EF lenses, I don't see enough in the RF lenses, from the the sample shots I've seen around the place and my very limited time trying out a couple, to make me keen to spend the money. (And of course, RF lenses mean an R system body, which means things like an EFV and poorer battery life, which I'm not keen on either - although I do like the sound of what I read about the AF accuracy.)
That said, from what I've read, one of the big benefits of the RF lenses seems to be AF speed. (Accuracy seems to be down to the R bodies rather than the lens, so applies to EF and RF lenses, I gather.) I have handled the RF lenses only briefly so maybe if I spent more time with them, the AF benefit would make me change my mind.
Also, I wonder if I would feel differently if I shot professionally. The costs would be business costs then, so might feel a little easier to swallow. On the other hand, if my old lenses were still working fine, you'd have to question whether changing to RF lenses was really going to increase income.
Anyway, I'm really pleased for the people who've bought into the R system and are enjoying it. For my own part, though, I'm not in any hurry given the current RF lens prices. And if I buy an R system body, I expect I'd mainly be using with EF lenses for the time being.