https://m.dpreview.com/news/0172829968/panasonic-announces-500-leica-dg-summilux-9mm-f1-7-lens-for-micro-four-thirds
Panasonic announces $500 Leica DG Summilux 9mm F1.7 lens for Micro Four Thirds
Panasonic says the lens' autofocus is 'capable of smooth, silent operation, complementing the camera’s high-speed, high-precision contrast AF system with the sensor drive at [up to] 240 fps.'
When manually focusing, the lens can be set to linear mode, which adjusts focus at a fixed rate with the rotation of the focus ring, or a non-linear setting, which will shift focus faster based on the rotational speed of the focus ring. This non-linear setting can be adjusted from 90 to 360 degrees (in 30 degree increments) to get just the right amount of throw for your needs, allowing pre-planned focus pulls when shooting video.
Also for video recording, Panasonic says it’s worked to reduce focus breathing as well as providing 'micro-step' aperture control for smoother iris adjustments, to ensure there aren't large (eg 1/3rd EV) jumps as the aperture is adjusted.