We could spend hours arguing about the full frame lens having mounted on a Micro Four Thirds, thus losing its magic, or the poor workmanship of modification work on the lens itself, or the focusing barrel distancing the rear glass away from the sensor leading to a image deterioration, etc. Maybe they are all true, or maybe there's more !!
The biggest problem in video (at least for us beginners) is motion, so very ironic !! Everything is moving in street videography; the subject is moving, the camera is moving, your hands are moving, the noise is moving, almost everything is moving in all direction while you are trying to capture them in a meaningful way !!!!