Aaron reviews LG's Optimus 4X HD, LG's superphone for 2012. Announced at Mobile World Congress in Barcelona and featuring a 1.5 GHz quad-core NVIDIA Tegra 3 processor, Optimus 4X HD packs a 4.7-inch IPS HD (720p) display, 8-megapixel camera with a 1080p HD video camcorder, front-facing camera, 2,150 mAh battery, HSPA+ 21 Mbps, and Android 4.0 with LG's revamped user interface. It goes head to head against the HTC One X and Samsung Galaxy S III, though it's a bit pricey to buy in the States. Is it worth the extra cash? Part 2 of 2.