The AT&T Samsung Galaxy S II has a 4.3” screen, 800×480 resolution display, 8MP Camera, 1080p HD video capture, a 2MP front-facing cam, Exynos 1.2GHz dual-core processor, 1gb of RAM, Android 2.3.4 with the TouchWiz UI, and 16GB of storage.
Interestingly this phone has an inactive NFC (Near Field Communication Chip) built right on the battery. The NFC chip will soon be used across the globe for mobile payments and act as a virtual wallet.
Here is the Video review with comparison of Galzy S II, Epic 4G Touch and Samsung Focus.
Video Via Engadget