This video shows some of the tests I did with the Panasonic Lumix G X Vario 35-100mm f/2.8 lens on my AF101.
Read my blog post for more information (german) and links to other sources:
The lens seems to be parfocal, but during zooms the picture gets blurry for a short moment. This problem also occurs with the Lumix 12-35, but there's one big difference between these two lenses: The 35-100 does not flicker while zooming.
Lens breathing is quite noticeable at longer focal lengthes, e.g. 100mm. At 35mm the lens performs quite well.
The OIS works fine and is strongly recommended for handheld camerawork. If you put your camera on legs, you should switch the OIS off, expecially when panning or tilting at longer focal lengthes.
I did not test the autofocus because I never use it.
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