Any professional 3D artist can recreate the face of a real person with enough high resolution photos taken at many different angles under the same diffuse lighting conditions. There probably is tech that exists that can scan a head in three dimensions but i don't think that is what they did here.
The reason he looks more detailed is because the real-life photos are projected onto the mesh whereas the CC textures looked like they were painted by hand or the photos used were of someone with very bland skin with no detail (or they removed any detail afterwards to give you a "blank slate") Couple that with models that had no character in their facial features and you end up with a very generic looking face.