i intend to upgrade my kit lens EF-S 18-135 f/3.5-5.6 IS to EF 24-105 f/4 L IS USM, the previous lens helped me well to learn at the first beginning but then I considered the quality so i consider the 24-105, but before i do so I'd to have opinions about this 24-105 for general purpose lens. I mostly make photos on the beach.