Frankly speaking, after I watched this video, I am glad I didn’t bought the Sigma 50mm F/1.4. Though the lens’s build is good, I find the quality of the photo to be average, I will recommend the Canon EF 50mm F/1.2L instead.
By the way, the models featured in this video looks “Thai” to me and their braces sort of destroy whatever that’s good and left of the Sigma 50mm F/1.4. Now that is my personal view. See the video and judge for yourself.