I'd say most "full synthetic oils" are still group III or a mix containing mostly group III. You can tell by looking at German websites, they'll say synthese-technologie or something, they're not allowed to advertise group III as vollsynthetisch there, has to be at least some % group IV though I'm not sure if it's just 50% or even more than that.

I was looking for oils for my car with group IV base oil and I don't think there was one. Or maybe ONE manufacturer managed to do it. Turns out the exact oil spec simply isn't very conducive to using group IV even if it is technically "better". Seems group IV is often used for expensive high quality racing oils that aren't trying to hit a bunch of manufacturer specs made in the 00s and 10s. Soon as you try to hit something like VW 507.00, you'll be using something that's mostly group III.