I'm almost sure that right now, it's the same stuff as Trident Z5 and you can push it above 8000 ... but with different heatsinks and cheaper. From some brands like G.Skill, Kingston, or V-Color, I see only Hynix A-die in 16GB modules and M-die in 24/48GB modules, so it can't get any better. Corsair keeps releasing weird kits to convince people with lower prices, and you can find Micron-based 6400-6800 CL40/42. Most other brands have almost only Hynix too, but it's easy to check as 6000+ CL30-34 is only Hynix.
Samsung is not existing in DDR5 right now. The first IC was pretty average, and no one is using their ICs in gaming/enthusiast kits anymore.