I was asking myself if the Angenieux 17-68 f/2.2 zoom lens is truly parfocal when using the ciecio7 c-mount to m4/3 adapter (which I highly recommend over cheap noname adapters). To find out I attached it to my BMPCC and tested if it maintains focus while changing the focal length at two different apertures (f/11 and at f/2.8). As you can see in the video, the Angenieux does an excellent job. So yes, it's a true parfocal zoom lens when used with a quality adapter.
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If you want to see some footage from this lens, take a look at this video: vimeo.com/110242230