The lens features a dust and splash-proof construction with a rubber sealing at the mount, though it is not fully waterproof.
No, the Sigma 50mm f/1.4 Art does not have Optical Stabilization (OS). It relies on the camera's In-Body Image Stabilization (IBIS) or high shutter speeds.
The lens requires a 77mm filter, which is a standard size for professional-grade prime and zoom lenses.
Yes, it is available in a native Sony E-mount version or can be used with the Sigma MC-11 adapter for Canon EF-mount versions.