Angenieux makes some of the THE BEST 35mm zooms out there period. They are now offering a lower priced sub 20k zoom lens with the quality optics you can expect from the Optimo Lens Series. 

Info taken from their website:

Only Angenieux delivers the best zoom optics for the new generation of large format digital cinematography cameras. Introducing the Optimo DP (Digital Production) Series - Optimo quality at an affordable price. It delivers industry proven superior optics and the functionality and ergonomic DP pros demand. Like a focal length of 30-80mm, fast aperture of T:2.8, calibrated focus marks, no ramping or breathing. All in a lightweight compact PL mount lens that weighs only 4.2 lbs/1.9 kg. Plus, like all angenieux lenses, the Optimo DP Series features our unique mechanical design for precise zoom and focus. It brings the very best of film to the new world of large format Digital Production.