Depends what you are comparing them with. If with older pkdm models: the seats on new ones are better. If you are comparing them with JDMs: in that case all PKDM cars have harder seats.
A Corolla Axio has softer seats than pkdm Corolla. All JDMs have good seats. Even the Vitz has better seats than the best PKDM we have whatever it may be. But local Toyotas have softer seats than local Hondas. So it depends