One problem with the 13" XPS is that 16GB configuration without a 4K+touchscreen display is only available in some countries (Europe, Hong Kong, ...?) I've been looking to get one (new macbook pro keyoard keeps breaking), but the buying experience has been pretty bad where I am.

I'll be in Japan later this month, and I'll probably buy an HP Envy. The XPS doesn't come in the aforementioned configuration and the Carbon X is considerably more expensive (and I can't make heads or tail of their Japanese site).

(portability is pretty important to me).