Yes, the C300 Mark III supports 4K DCI and UHD recording at up to 120 fps in 4:2:2 10-bit XF-AVC or Cinema RAW Light.
With the standard BP-A30 battery, you get approximately 130 minutes of recording. The larger BP-A60 battery extends this to roughly 280 minutes.
Yes, the C300 Mark III features a user-interchangeable lens mount. It ships with an EF mount, but can be converted to PL mount using the optional PM-V1 kit.
Yes, the Dual Gain Output (DGO) sensor is specifically designed to maintain high dynamic range while significantly reducing noise in low-light environments.