A 24-70mm f/2.8 lens is the workhorse of choice for a ton of photographers and filmmakers, offering a versatile focal length range and a wide maximum aperture. They can be quite expensive, however, which is why Sigma's 24-70mm f/2.8 Art, which is about half the price of first-party options, is so intriguing. This excellent video review takes a look at the lens and if it can compete with more expensive options.