How detailed are 3d scanners like XYZ Printing 3d models?

Hey guys, i was just wondering do 3d scanners produce detailed 3d models? for example for a head-can day show details like small pimples or skin pores?

or do they just model major features like shapes of nose, eyes, etc.?

I have seen textures made from 3D scan data and they are very detailed, skin pores and small pimples all included.