For example, compare a cine lens like the Zeiss Compact Prime CP.2 50mm/T2.1 ($3,900) to a high-end DSLR lens like the Canon 50mm f/1.2L ($1418). Both are EF-mount, have the same focal length, and it seems the Canon is a faster lens. Another example is comparing the Canon CN-E 30-300mm T2.95-3.7L ($45,000) vs. the EF 28-300mm f/3.5-5.6L IS USM ($2700).
What makes a cinema lens so expensive (construction, image quality, etc...)? What can these lenses do that normal high-end DSLR lenses can't? Can photographers benefit from the features of cine lenses?