South Korea's Samsung Electronics Co. is quickly catching up on Sony Corp. in the Ultra HD TV sector, expanding its foothold in one of the Japanese firm's most successful business areas, data showed Wednesday. The world's No. 1 maker of TVs held 14.9 percent of the global UHD TV market in the fourth quarter of 2013, narrowing its gap with Sony which commanded 18.2 percent, according to market researcher DisplaySearch.