Samsung's top-of-the-line smartphones, the Galaxy Z Flip 4 and the Galaxy Z Fold 4, are official. This year, company has taken an iterative approach towards upgrading the foldable devices with a focus on refinement over all-out upgrades, though there are significant improvements to be found in performance. Roobina Mongia brings you a hands-on with the two phones to get you all the details on what's hot and what's not so great about Samsung's premium offerings.