no. try AP + CDR (DFG)... AD sona maybe in some scenarios, but definately not AD janna.
Due to the Crystal Scar Aura, there is a LOT of armor pen inherently, so early game ADs are very strong.
early game, the dominion aura will usually give you less than 2 armor pen if you play someone who already has arpen runes and you are targetting a squishy, like you should.
mid and late game tho, it becomes much better, especially when combined with a LW and the mastery, for a total of 52% arpen iirc.