This lens is an EF 85mm 1.2 L USM.
Features
Focal length and maximum aperture: 85 mm f1.2 
Lens construction: 8 elements in 7 groups 
Diagonal angle of view: 28°-30° 
Focus adjustment: Front group linear extension system with USM 
Closest focusing distance: 0.95m / 3.1ft 
Filter size: 72mm 
With a large maximum aperture of f/1.2, this is the fastest 85mm telephoto lens in its class
With a large maximum aperture of f/1.2, this is the fastest 85mm telephoto lens in its class. One aspherical lens element and two high-refraction elements give sharp images with little flare even at the maximum aperture.
The floating system corrects coma for high image quality.