So clocked 30+ hours on the Focal Radiance now, and I can say I've now owned and tried every Focal, for some reason.
Stellia is the Focal I've spent the most time with (500+ hrs use) and I'd say Radiance along with Stellia leans alternative in Focals lineup. They are exceptional, the detail retrieval is excellent but dialled back slightly from the likes of a Clear or Celestee. But they have the thing most non berylium Focals lack, timbre, warmth, thickness, lushness. While still being technically superb.
I'd say price taken into account, with these sitting at 700ish on the used market, these are the best value hifi closed back on the market that I've tried and the most likely favourite for the average person. These are very enjoyable and would seriously make me question forking out the extra 1.5-2k for a Stellia. Actually, they'd make that proposition seem outright mad. Because while Stellia are undoubtebly more detailed and exciting, Radiance bring some extra body, some extra meat on the bone, while still being plenty detailed and dynamic.
Plus, Radiance is a headphone you can wear outdoors and not feel odd about. Stellia & Celestee, imo, just aren't headphones i'd wear in public, while Radiance just looks like a headphone, albeit still a very beautiful one, the black is much easier to work with without drawing overt attention.
Oh and with regards to Celestee/Elegia, i easily prefer the Radiance. Not even close. Technically they're all fairly similar but the Radiance has the biggest staging and overall sense of size, while being tuned far more agreeably than either of the others.