I assume the ii version will fix some of the problems with the earlier version.
Alas, the 20/1.7 II may only be a pure cosmetic upgrade : optical diagram and MTF curves are exactly the same as the "old" version on the panasonic website, and the press release does not mention any AF speed improvement (which was considered the main drawback of the lens).
Also any thoughts on the pan fisheye lens?
Much more expensive (2x here in EU) than the samyang/rokinon one, of which I'm quite pleased - but would be even more if it had a chip to pass at least the focal length to the camera's IBIS : the 300$ or so of the lens seem still expensive without that simple chip. Otherwise, the IQ is quite fine and the lack of AF not a problem at all with such a focal length.
Don't forget that kit zooms are often pretty good allrounders these days - the Oly 14-42 II is no slouch either.