We're used to F1.2 lenses being, well, massive. The Nikkor Z 50mm F1.2 S and Canon RF 50mm F1.2 L USMare both heavyweight contenders. The FE 50mm F1.2 GM comes in at 1.7 pounds, about a quarter pound less than Canon and a half pound lighter than Nikon's take on the concept. It's also a bit smaller all around. At 4.3 by 3.4 inches (HD), it supports reasonably sized 72mm front filters, and doesn't make your camera system as front-heavy as the 50mm F1.2 options for other systems. Sony has really done something here, delivering an F1.2 lens that is, for all intents and purposes, no bigger than the Sony Zeiss FE 50mm F1.4 ZA. The FE 50mm F1.2 GM is one of many fast-aperture primes available for the Sony system. It's part of the G Master series, Sony's top tier of lenses. It's positioned above the Zeiss line 50mm F1.4 ZA, still available for around $1,500. Sony also offers the Zeiss 55mm F1.8 ZA for around $900, and if you don't mind a budget build (and optics), you can get the Rokinon 50...
-- pcmag.com