The-Digital-Picture has completed their review of the RF 24-105mm f/4L IS USM for the Canon EOS R system.
Compared to the EF 24-105mm f/4L IS II, Bryan found the RF version to be slightly sharper with less linear distortion, but it did show a bit more vignetting.
The RF 24-105mm f/4L IS appears is a great option for an all-purpose lens for your EOS R, especially if you want the native mount.
With this lens, you get an ultra-useful focal length range in a lens sized for comfortable long-term use without creativity-killing fatigue. This lens smoothly focuses very fast with consistently excellent accuracy and the image quality is great with 5-stop image stabilization helping to maintain that desired quality. This lens is well-built, including weather sealing, and is ready for professional-duty use, but it does not cost a fortune. Read the full review