I found your thread, I am in the same boat as you. The only difference is that I already bought the Asus Zenbook 3 days ago and I am testing it as I am typing this. Asus is a better brand by far to Sony in computers, but I do like the specs of that Sony, with the SSD and the 3rd gen i5 processor.
I will continue to play with this Asus and hopefully it does the trick for what I need it for. I am also looking for the some reviews on the Sony and cannot find any.