The Sigma 28mm F1.4 DG HSM Art is a fast, wide-angle lense with a field of view made popular by the current wave of roughly equivalent smartphone camera lenses.
The Sigma 28mm F1.4 DG HSM Art is designed to meet rigorous cinema lens standards and specifically cut down on image distortions like axial aberrations.
The Sigma 56mm F1.4 DC DN Contemporary is smaller sensor cameras like Micro Four Thirds and Sony APS-C E-mount cameras. It works out to a short telephoto portrait lens on those crop sensor bodies.
The Sigma 70-200mm F2.8 DG OS HSM Sports is the latest version of a classic telephoto zoom that's a staple in most pro shooters' bags.
The Sigma 60-600mm F4.5-6.3 DG OS HSM Sports is a 10x zoom lens that can shoot just about anything if you're willing to put up with its relative heft—there are 25 elements inside!
The XCD 1,9/80 is an 80mm lens with the fastest aperture in the X1D lineup. It works like a 63mm body on a full-frame lens, which makes it a slightly awkward focal length if you're used to the standard 50mm and 85mm options.
The XCD 2,8/65 is a standard lens that acts like a full-frame 50mm lens which is great for walking around or loose portraits.
The XCD 2,8/135 is a short telephoto portrait lens that's compatible with a 1.7x tele-extender in case you need more reach for things like sports or wildlife photography.