Like I said, compare a new Kia versus a Hyundai vehicle in the same class and I gave the Forte-Elantra example. We already know the Kia Forte comes with a torsion beam platform and 4 A/T base. the new Elantra is not out yet, but I bet it will have independent rear suspension and at least 5 A/T standard if not 6 A/T.
Kia Forte interior quality is basic - all low-ish grade hard plastic while I guess again Elantra will have nicer materials (soft touch?).
In my opinion, Hyundai is keeping the Kia to compete on the lower spectrum of the class (Corolla, Lancer, old Focus, Cobalt), with its main attributes being lots of features, lower price (just like Hyundais used to be) while Elantra will be higher quality and higher price competing with Civic, Jetta/Golf, Mazda3.