Bong Joon-ho is brilliant.
I'm so glad he's making more movies.
Some of the Rokinon lenses are excellent optical quality.
Their 16mm is sharper than the Zeiss equivalent and their 135mm f2.0 is sharper than Canon's L version.
I love Indian cinema. I wish we had more Indian films in USA theaters. :/
This camera seems really cool. It's seems a bit pricey for most indie shooters, but with 10 bit 4:22 I could see it as a good camera for small feature films.
I'm interested in what the image looks like.
I still love the image from this camera. It looks amazing.
Due to the engineering of the most lenses, they are usually sharpest between F/5.6 and F/8.0. Stopping down lower than F/8.0 will usually increase softness and stopping higher than F/5.6 will usually increase softness. (It's a good rule of thumb, as very lens will always be sharp within the F/5.6 and F/8.0 "sweet spot.")
DXO Mark is a website that scientifically analyzes lenses. It is a great reference tool for individual lenses and how they are engineered.
Also, according to DXOmark, the Sigma Art 18-35mm F1.8 is actually quite a lot sharper than the Canon 50mm F1.8 prime, so unless your lens is defective, than it is not the problem.