A new SIRUI 50mm T2.9 Anamorphic lens is coming soon to Indiegogo (in the US Sirui lenses are sold at Adorama, Amazon, and B&H). Here are the details of the new lens:
Wider than Wide features a 1.6 times squeeze factor
Immersive Experience - 2.8:1 CinemaScope Aspect Ratio
Match Perfectly with Full frame Cameras for RF, L, E, Z mount