Since the turn of the current century, Cadillac has struggled mightily to transform its brand image from a purveyor of old-school American land barges to a creator of engaging drivers cars. In that time, particularly the last half decade, GM’s premium brand has created some excellent cars. Unfortunately, the market is increasingly disinterested in sedans. In response, Cadillac is expanding its crossover utility lineup, slotting in the compact XT4 at the leading edge of the spear. Is it sharp enough to win over customers?