Yes, it features a dust- and splash-proof structure with a rubber seal at the mount, making it suitable for professional outdoor shoots in light rain or dusty conditions.
No, it does not have built-in optical stabilization (OS). It relies on the In-Body Image Stabilization (IBIS) found in most modern Sony Alpha camera bodies.
Absolutely. The de-clickable aperture ring and quiet stepping motor make it a top choice for professional videographers seeking shallow depth of field without mechanical noise.