Let's see the power of the 4K side.
So there's that and even playing 4K Video may require quite the GPU. I doubt the 850M is up to the task.
I am thinking of buying the Asus Zenbook NX500 (15.6-Inch 4K2K Quantum-Dot Touchscreen Display Laptop, 512 GB PCIe SSD, Core i7-4712HQ, Nvidia GTX 850M, 16 GB RAM). Question is should I buy or wait a few months for the 2016 laptop launches?