30m dataset
For me the best image for the matter of this comparisson is the first one. And if you can do the trick for be in a point where the trees shadows are full, then even better.
The 30m dataset result is PURE LOVE!! Mountains profile are radically improved (i was surprised about how much they are, in this image can see very clear).
For my opinion, your picture is the total winner compared with all the others engines. Its almost REAL. And this, taking in account Outerra engine strong point, where no other global engine can compete, is when you go down to the floor..
What i just miss is a bit more color (saturation), and a little bit more blue. Adding it in photoshop end up in a literally real picture.