I don't know, there is a very different look to these two examples for rock displacement. The first one done with vue has more of these rectangular shape, deep cracks, whereas the rock in Ryans (beautiful) image has a stronger impression of volcanic, organic, flowing rock.
I agree though that I think the same or similar displacement could be achieved with TG2, but not by simply applying a power fractal, or otherwise out of the box (in the sense of a single shader from the menu). There where other renders that came close to the displacement like in the vue render, but I have yet to see one that has the same type of displacement.
It could be an interesting challenge for us in this community, to work out how this can be done in TG2. I would put my bet on a combination of power fractal, voronoi, and possibly image (displacement) maps.
Frank