Samsung Electronics Co Ltd is losing smartphone ground not only to cheaper Chinese rivals but also at the high end to Apple Inc, a survey showed, in an ominous sign for the South Korean giant as Apple readies to launch its next-generation iPhone 6. Samsung last week gave second-quarter earnings guidance that was far weaker than expectations and is on track for its worst quarterly profit in two years, a performance the company attributed in part to price competition and higher inventory levels in China.