I really don't understand why the Macbook Air is compared with all these Laptops. The Air always was crap. I'd love to see how these laptops are rated against the Macbook Pro Retina 13 inch.
Everyone who is looking for a very good subnetbook will compare it against Apples system. It just weird that this casual notebook is seen as a benchmark for devices that even have a dedicated graphics card and really good/interesting specs.
I'm sure the XPS 13 wants to be a Macbook Pro competitor - not a "Macbook Air competitor".
November 2013 update. Here you will find the current best subnotebooks reviewed by Notebookcheck in the last few months. Our list of top models is regularly updated, maintained and commented on and should assist in purchase decisions.