Yet you keep comparing it to the iPad when you should be comparing it to the MacBook Air which has similar hardware, roughly the same price, the ability to connect external storage, external displays, has USB 3.0, has an SD card slot (on the 13" model).
But the MBA has so much more going for it: PCIe based SDD, Intel HD Graphics 5000 (vs 4400 on the SP2), 802.11ac (vs 802.11n on the SP2), Thunderbolt, a "real" full-sized backlit keyboard, a useable trackpad, the ability to run OS X or Windows, and the trump card, 9 to 12 hours battery life (reportedly 15 hours with Mavericks).