All of the abiliies shown above except for Death Field are Single-target though, so it's a poor comparison IMO.
Deathfield/force in balance only hits 3 people not five. 5k sorc/sage hits are not common at all, with min maxed sorc even. More like 4.2-4.5k on a good day. Hybrid even less, for obvious reasons.
Fob/deathfield - thats the best burst a balance/madness sage/sorc has got.