Having owned the Radiance, I’ll say it’s a wonderful headphone. It’s supremely comfortable and feels luxurious. It has a warmer sound signature than other Focals (likely due to the Naim influence)- not a bad thing at all, just different.
While in my case it wasn’t ideal with my amp situation (OTL tube amp and I didn’t realize the impedance mismatch was a factor as I was still learning about my amp), I would probably greatly enjoy them with my solid state amp now.
I always loved the Radiance with my DAP, and if I were made of money, I’d use a Radance as my closed-back option for travel where I have space for large headphones.