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One further note on hardware quality: Perceived hardware quality is something Apple is fantastic at. Their laptops look and feel great. They feel like they'll last decades. This is misleading since they're actually built to be disposable. e.g. If you spill coffee on your Macbook Air, it's dead. You can't fix it because you can't remove the battery in a timely fashion and don't have the tools to open it. Apple won't f…
Regarding other manufacturers putting retina displays. While not quite retina level, ASUS did fire a preemptive strike against the MacBook Air, by releasing their UX21A and UX31A ultrabooks with 1920x1080 IPS displays. The UX21A 11.6" ppi is 189, not far from the new MacBook Pro 220 and perhaps more interestingly, now ASUS' ultrabooks have much better displays than the airs, with the 11.6" air being stuck at a measly…
Plus, unless you have an OS that can take advantage of it, higher resolution in a 11" ultrabook machine does not make sense.