I have used the R6 Mark 2 since July and I have shot nearly everything from corporate events, headshots, portraits, parties, pro hockey, high school wrestling, and poorly lit family functions with this camera. Finding any con is really nit picking. The sensor is fantastic and image rendering is phenomenal. 24mp is more than enough resolution for most use cases.
The noise handling on this camera is very impressive. I am able to obtain useable images at ISO20,000 to ISO 32,000, and have even put out acceptable images at ISO 102,400, albeit they are a bit noisy. The files react well to noise reduction and are very user friendly in Lightroom and Luminar Neo.
The EF to EOS R adapter works very well and EF glass works flawlessly on this camera. An EF 16-35 F2.8 rides on mine for everyday use.
This camera is so good, I am not sure buying anything else makes sense, unless you have some very specific use cases. I love this camera so much that I will probably add a second body to my pro line up.
It’s worth every penny. I don’t find much wrong with it. I think Canon nailed it with the R6 Mark 2.