I just did a bit of testing.

ACN lvl 50 Ifrit Tome
INT-387
Determination-291
Crit 386
Ruin II-crit 210 normal 145-160
Energy drain- Cirt 406,Normal 270-290
Shadow Flare 65-77
Dots-Bio,Bio2,Miasma,Thunder,Aero
Dot tick range 314-380 middle range of 340-355
Dot tick range with raging strikes(180s) 380-405
Dot tick range with raging strikes(180s) + internal release(60s) 414-487
Emerald Caryb Auto attack 130-145 crit 213


SMN LVL 50 Ifrit Tome
Int 394
Determination 290
Crit 415
Ruin II-151-160 crit 230
Energy Drain-282-303 crit 440
Fester-580-600 crit 900-1000
Shadow Flare-65-77
Tri-Disaster(lul)-57-60 crit 81
Dots-Bio,BioII,Miasma,Thunder
Dot tick range-285-320 middle range 315 High of 347(crit probably)
Dot tick range with raging strikes(180s) -340-386
Garuda Auto Attack-148-162 crit 250

There is not a whole lot different. Granted fester is amazing. Best thing about summoner, but as a whole the damage remains about the same, even with less int on the acn. I still love the class of course, but a bit of a disappointment really.