Walk up to your holoterminal when there is no active quest on it and click on it. For a split second, your character will shift to the true high-res textures.
There will be a change in lighting as well, which may deceive you into believing it's simply a lighting change, but as you can see in my images, there is a distinct change in the crispness of the textures themselves, regardless of lighting.
Peace,
-Rhykker