Sirui 40mm Autofocus T1.8 1.33x Anamorphic Lens, Blue Flare (E Mount) vs Samyang VDSLR T1.5 MK2 Prime Cine Lens (EF Mount)
Specs side by side at each model's entry configuration, with the cheapest crypto price for each.

Sirui 40mm Autofocus T1.8 1.33x Anamorphic Lens, Blue Flare (E Mount)
1 configurations
from $931

Samyang VDSLR T1.5 MK2 Prime Cine Lens (EF Mount)
3 configurations
from $486
1 of 1 specs differ across these 2.
Questions
What is the difference between the Sirui 40mm Autofocus T1.8 1.33x Anamorphic Lens, Blue Flare (E Mount) and the Samyang VDSLR T1.5 MK2 Prime Cine Lens (EF Mount)?
1 of the 1 specs we track differ at their base configurations. The table above marks every one, and flags the better value wherever a spec has a better direction.
Which is cheaper?
Samyang VDSLR T1.5 MK2 Prime Cine Lens (EF Mount) from $486, $446 less than the Sirui 40mm Autofocus T1.8 1.33x Anamorphic Lens, Blue Flare (E Mount). Both are the cheapest total, shipping included, for the entry configuration.
Are you comparing the same configurations?
Each model is shown at its entry configuration, which is the only fair basis for a like-for-like table. Open either product to switch memory, storage or chip and see how its price moves.