Wide-aperture 85mm lenses are the classic choice for portrait photography, but, of course, they are not the only focal length you can use. 135mm lenses have long been a popular alternative choice, and several companies make impressive options. This great video review compares the Sony FE 135mm f/1.8 GM, Samyang AF 135mm f/1.8 FE, and Sigma 135mm f/1.8 DG HSM Art lenses.