What a bunch of nonsense about the metrics.
The rMBP has a slightly better build quality but that is about the only thing.
The Asus I read about has an IPS panel and more than 1080p currently makes no sense in Windows. The GPU has 2GB GDDR5 and the same 900Mhz clocks. The battery is slightly smaller but that is about the only accurate thing from Mr Fanboy.
MBP for comparison
All the touch notebooks sport the same specs as the normal UX51vz at least here in Europe.
If you use Windows buy a Windows notebook. Bootcamp is a solution for those that occasionally use Windows but that is it. The Touchpad in bootcamp is crippled to the point of being vastly inferior to the touchpad and drivers you get on an Asus or Samsung. The battery life in bootcamp suffers so much that the battery size difference is more than equalized. The active dedicated graphics in bootcamp also means that in many cases you end up with a more noise notebook with medium load.
But to the choice of Windows notebook.
Don't get touch. You don't need it. The touchpad comes with gestures that work for all the functions you actually need. The Desktop which you will mostly use anyway still works the same and doesn't even want touch. Most importantly though you can actually have a matte panel if you ignore the touch. I would get the matte any day over the touch.
Touch imo only makes sense on hybrid notebooks that you can transform into tablets like the Asus Taichi, Lenovo Yoga and so on. It is nothing more than a gimmick on a normal notebook.
Personally though I would get neither of those. I think the Samsung 770Z5E offers way more for much less money. Put an SSD in and you got amazing battery life a great high contrast Panel that beats the rMBP panel.
It is not quite the aluimium build of a zenbook but if you don't carry it around all the time the difference doesn't justify the price IMO.
Faster graphics than the current 650M and a AMDs GCN which is way better than Kepler should you ever need GPGPU qualities. Kepler is great and power efficient at gaming but sucks in most other areas were sometimes even hot old crappy fermi beats it.
Only buy a Mac if the majority of time you will use OSX. Otherwise you are much better of with a real Windows notebook. Bootcamp is okay for some gaming, where touchpad, battery life don't matter and fans are running full tilt anyway, but not a place any sane person should spend most of their time.