I personally think that there is not a real solution in the market about Dynamic GI at this moment, most of them are just demos in the siggraph hehe, you can watch that beautiful demos from NVIDIA about cool particles and bla bla, but nobody use that in your games, because is unreal for production, the most advanced solution until now, “I guest”,comes from games like GTA5 or Assassin creed, but hey!, that companies have armies as developers and they have their own engines