Moon3 started dominating in 2014. He was 2nd in a few tournaments in the 2010-2013 period, but after that he became unstoppable. Recently, I know he lost a series (5-4) against AoTeman a couple of months ago in the group stage of a tournament, but he still ended up winning the tournament (this was a Chinese only tournament).
Their players usually quit after a few years of intense ra2 which gives a chance to others to take their spots. Moon3 started playing around 2008. There are several other legendary Chinese players who retired before that (or before Moon3 got really good), so we'll never know how Moon3's current skill level would do vs those players in their prime.
I think the semifinal series vs jayaxi is even better than the final so I suggest you guys watch that too.