It's actually not a ringflash. The Canon EF-M 28mm has two diodes around the front element and it works quite well. Eats a lot of battery though. It's very visible on the Salticus big puppy eyes.
I believe both of these are with autofocus, but I'd have to check to be 100% ... Usually with the fast movers I have more luck with AF, but I try to switch it up.
Sigma 105mm is a great lens, and sure to stay in my selection, but right now I'm itching to try out the R7 and the RF100mm in the field. I had some good results with R7 and the Sigma last autumn, but have yet to try the 100, that I splurged for some months ago, for real.