I wish they had done these kind of small lenses sooner. I mean, that's the point of MicroFourThirds, right? It would have really started more of an interest in mirrorless and the MFT platform sooner. The first lenses were smaller than DSLR but still large. With the Panasonic GM1 and these lenses, they're finally opening up the potential of the format. I like it and it's the first time I think they've nailed it for the average consumer. My only wish is that they have a better price line up, because people can still hardly buy an extra lens. The Olympus 45mm remains the only steal. Yes second hand market is good to pick up 14mm Panasonic.

http://www.ephotozine.com/article/olympus-om-d-e-m10-14-42mm-ez-ed-msc-sample-photos-23995

http://www.photographyblog.com/reviews/olympus_m_zuiko_digital_ed_14_42mm_f_35_56_ez_review/

The lens power zoom work with gh4?

14mm

42mm

http://www.ephotozine.com/article/olympus-m--zuiko-14-42mm-f-3-5-5-6-ez-ed-msc-lens-review-26471