It's not just the main items you need to compare, because it's the small things that Apple sweats, things that most PC manufacturers figure customers don't care about. Apple focuses on the big picture and how hardware and software work together to provide great performance, while also recognizing you need to maintain battery life and weight and end-of-life recycling of the product. Using carbon fiber, that XPS piece will end up in the landfill, because you can't recycle CF.
I would also note, as I have previously, that before everyone jumps on the bandwagon about these new wave of PC's being faster, better, stronger, longer-lasting, wait until there are some real world tests. Because if the past is any guide to what you can expect, you'll be sorely disappointed.