Hellwig doesn't list sway bars for 2014, but they don't list 2014 for anything so it's likely just old documentation. Assuming that the 2013 will fit the 2014, they have a 1 5-16" Front and a 1 1/4" rear.
Roadmaster on the other hand lists a 1 3/8" front and a 1 1/2" rear though only through the 2013 and 2012 model. Again, likely just old documentation.
From the posts I've read, "every 1/8 inch increase in diameter produces a 30% increase in strength" or 60% stronger for the Roadmaster. I don't have either product (Roadmaster, or Hellwig), but from my research for my truck (2000 F350 DRW) I'll go with the Roadmaster when I replace the factory rear swaybar.