Hi Seth,
I would propose that the “best” B4 zoom lenses are the Zeiss Digi Zooms, they cost about $40+ street and are rarely available on the used market. The next best are the Canon and Fujonon Cine Zooms. It so happens that I’m selling two of the Canons, both 21×7.5 and 11×4.7 separately at $10K or as a pair for $18K. These lenses have very little breathing and have better contract and less chromatic aberration then the comparable ENG versions. They have neither a built in doubler nor iris & zoom motors and require matte box/sunshades as they do come with rubber sunshades as ENG lenses do. If you are interested please feel free to contact me off list at john at sharaf dot net. They are in pristine condition and like-new. I’m selling because I just got my Arri Alexa and am investing a small fortune in PL mount lenses, including an Angenieux 24-290 Optimo (17 inches long and 22 lbs!!!).
Best regards,
JS