J.C. Penney's comeback won't happen overnight, but unlike most of its rivals, the company is making meaningful changes that will bring customers into its stores. Though comparable sales fell last quarter, the dip was much smaller than in other department stores, and management was confident enough to maintain its full-year guidance of 3%-4% in same-store sales growth. If it can hit that figure, better things will surely be in store for J.C. Penney investors.