From the LensRentals Blog:
We’ve been impressed with the Sigma Cine lenses. We weren’t surprised that they’re generally sharper than classic Cine primes; that’s what we’ve come to expect from Sigma. We were pleasantly surprised by the smoothness of focusing and aperture and the apparent build quality. Since we’d previously done teardowns of the Zeiss 85mm T1.5 CP.2 and Rokinon Xeen 85mm T1.5 lenses, and recently done a teardown of the Zeiss 85mm T1.5 CP.3 lens, we thought taking apart the Sigma Cine 85mm T1.5 would provide a nice comparison.