s4 is a new device fro around 2 months. Then android version 5 key lime pie gets released along with the xphone, then the competition will begin. So i would rather sit on fence until may.
I have been using 4 Samsung cellphones in the past three years. Two were feature phones and two smartphones GS1 and GS3.
Now I may pass S4 due to my failed expectations from it for not having a build quality and premium looks.
I'll replace my GS3 to Xperia Z as I already checked and hold it. The glass body and classic design is simply gorgeous and eye candy.