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Gelfand, hands down. I have been studying endings all year with two friends, and we are amazed at how often his games come up as examples of excellent play, even in very esoteric, technical endings.
Look at this game after move 74. Gelfand's technique is superior, and he draws this.
http://www.viewchess.com/cbreader/2013/7/29/Game11053123.html