There are numerous genres out there in which a 24-70mm f/2.8 is the bread and butter lens, offering a focal length range that allows for wide angle coverage on to portraits and more, paired with a wide maximum aperture. However, such lenses are rarely affordable, though Tamron's 28-75mm f/2.8 Di III RXD G2 bucks that trends and offers a lot of performance for not a lot of money. This great video review takes a look at the sort of image quality and performance you can expect from it.