I just got my af3 completed on Thursday. Our setup included the following:
PLD 75
PLD 70
DRK 75
MNK 58
WHM 59
WHM 53
WHM 56
THF 62
BLM 58
THF 51
DRG 53
RDM 75
and a few others in that level range. We killed him very easily. 1 person died each time, because of mistakes, but other than that it went very smoothly. o.< I think a high level tank, plenty of healing, and a good mix of DD can take this guy out quick. Have fun. :P