Samsung Galaxy S 4 with Exynos Octa-core: what's different?

Samsung's latest flagship, the Galaxy S 4, comes in two distinct flavors -- and they're both good. One uses the much-hyped Exynos Octa-core chip, while its identical twin takes advantage of the quad-core Qualcomm Snapdragon 600. In either case, the availability depends on where you live: the Exynos-powered I9500 is difficult to find in North America (at least for now), but our friends at Negri Electronics, an online retailer currently stocking the Octa-core device, gave us the opportunity to play with a unit for a few days. During our time with the device, we were able to get a solid feel for how this particular version of Samsung's flagship compares to the Snapdragon 600-powered model. So how does it hold up against its Qualcomm brother in terms of performance and battery life? Read on to find out.