I think that the new PF APG iconics might be a little trickier mechanically.
You mean trickier to convert to FC? Not as much as you might think. The fact that PF lets you spread around skill points more liberally helps you port characters made under the 2 sp/level paradigm easier to port over to FC's 4/level minimum than porting from D&D. Also, like FC, PF uses a shorter skill list than D&D.
What's really trickier is things like paladins, and to a lesser extent, rogues. Tricky, but fun, as it takes a bit of creativity. I made the iconic Paladin from PF (Seelah) into a Crusading Shield Bearer Soldier (eventually segueing to Paladin, natch), whereas I decided to make Sir Torsten Trueblade (from DCC 51: Castle Whiterock) a Crusading Warden Captain.
But more traditional paladins might lean towards Lancer; I shied away from that as the dungeon crawl environment I was targeting isn't too mount friendly.
It's also interesting to me that the most natural fit for Paladins, the Crusading origin, is a human talent. That's an interesting reflection of the old school idea of paladinhood being primarily a human thing.