Yong and Toby are the only people on my list that i've ever acknowledged as epic players.
Yong (Alan, Sparta's leader)
Toby (Some guy from Ghost Korean, some really old gen clan, the person who I learnt things off)
Not sure about the current players.
Most people are around the same level as each other, haven't seen anyone who can top someone epic by a mile on ijji so far.