Blackmagic 6K Pro has a Canon EF lens mount and currently there are 257 native lenses available for this mount.
The latest released lenses that are compatible with the Cinema Camera 6K Pro are the Samyang MF 14mm F2.8 Mk2, the Samyang MF 85mm F1.4 Mk2 and the Irix 45mm F1.4.
Blackmagic 6K Pro doesn't have a sensor based image stabilization system but
78 of these lenses already comes with optical image stabilization.
Since Blackmagic 6K Pro has a Super 35 sensor, it has a focal length multiplier of 1.5x so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on Cinema Camera 6K Pro.
You may also also be interested in these:
Blackmagic 6K Pro Lenses with Image Stabilization
Blackmagic 6K Pro Lenses with Weather Sealings