Perhaps no lens is more ubiquitous than the 24-70mm f/2.8. A versatile performer, the 24-70mm f/2.8 is equally at home in a huge range of genres, making it a favorite workhorse of many different photographers. However, such lenses can often be rather expensive. So, at $1,100, can the Sigma 24-70mm f/2.8 DG DN Art compete with the Sony 24-70mm f/2.8 GM II, which costs more than twice as much? This excellent video comparison takes a look at both.