I picked up this lens when it was $100 off. It has since gone back up to the msp of $499 USD. I got it for doing Fresh 48s where I needed a lightweight lens that would allow me to get portrait-quality photos in low light and close quarters.
I had been using the RF 28-70, but it's too heavy for all day use in hot rooms, and it was getting banged around. I needed something lighter, and less expensive to replace if something should happen to it. The RF 35mm fit the bill perfectly.
I do notice quite a bit of a vignette at the corners, but it's easily removed in post if I don't want it. Most of the time I just leave it as it's not too distracting and offsets the subject. If the room is very dark, it will hunt and sometimes have trouble locking on. I can up the ISO a tad, focus, and lower the ISO again and it'll lock for me.
Unfortunately, I don't have any images to share with it yet. I've taken hundreds, but they're all HIPAA protected and I cannot share them online. I'll add one or two when I get them.
Even with the faults I listed, it received a 5 star rating from me due to the value vs. the price tag. I think anybody could pick up this lens and get some pro quality images out of it.