Had my first canon RF lens yesterday (I have a Samyang 85 1.4rf as well), a 15-35 2.8. What a lens. Love the build quality on these lenses, only taken a few images but seems obviously awesome. The IS is amazing as well. Easy 2 second exposures handheld now. Took a week to come from Panamoz if anyone is ordering. Still waiting on my 28-70 f2 from Wex tho.