A full frame camera will always have 'true' wide angle and telephoto results.
However, a 1.5 or 1.6 crop factor will add that much on top of every focal length, be it wide, standard or telephoto.
Digital users always find that their smaller sensors give them more reach, i.e. a 50mm lens will become an 80mm lens, a 22mm lens will become 35.2mm and a 75-300mm lens will become a 120-480mm lens.
But that gives a disadvantage to anyone who wishes to take landscape photography, or indeed anything which involves wide angles.