expired Samyang SYIO85AF-E 85mm F1.4 Auto Focus Weather Sealed Lens for Sony E-Mount - $653.01 USD (~ $968.14 AUD) Delivered @ Amazon US
Can also be bought via Amazon AU here but works out to be dearer.
For Sony E-mount full-frame & APS-C Mirrorless cameras
Aperture range: f/1.4 to f/17
Ultra multi-coated Optics; weather-sealed
Takes front filter size of 77mm
Constructed of 11 elements in 8 groups