I ask a lot of this lens, and it rises to the occasion!
I own a Lumix G7 MFT camera that I use mainly for film/video purposes. Most times I am filming dancers. That being the case, I am often outdoors or indoors in a club type atmosphere filming. My filming conditions are unpredictable and never perfect. I've used Rokinon lenses before on Canons and was not disappointed. The 12mm Cine lives up to the Rokinon name is quality of construction and image. For the price, it just CANNOT be beat. Would I like more sharpness at the edges? Sure! But considering the price point of this lens, it performs much better than the price would suggest.
If you're looking for a great wide angle cine lens and are on a tight budget, go with this all around great lens!