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Not all lefties...the ones that have the potential to crush a fastball of his.
Do you remember the game against the Sox where he removed David Ortiz's bat by ripping off the big man's arms one cutter at a time? Remember it got to 3-2 with two on and two out in the 1st and he looked to be struggling a bit with his command...and Ortiz was all geared up to crush the fastball...and Fister run a cutter with 5 inch gloveside break in off the plate...and Ortiz struck out with a weak arm swing and looked at Fister with an expression that read: "You don't have that pitch! What was that pitch?!?!"
I think Fister will probably always treat the cutter like a lefty-equalizer and therefore only feature it against power hitting lefty-loaded line-ups.