No word on compatibility yet? Will it work with the GH1/GH2 without a firmware update?

While subjective assessments of test shots and video clips showed them to be acceptably detailed, with natural-looking colours and an adequate dynamic range in outdoor lighting, our Imatest tests revealed the new lens suffered from the same performance issues as most extended-range zoom lenses.

At no point did the resolution recorded in our tests reach expectations for the 16-megapixel sensor in the GF6. Interestingly, corner and edge softening was less than we found with the original 14-140mm f/4.0-5.8 lens, as shown in the graph of our Imatest results below.

http://www.photoreview.com.au/reviews/lenses/m4-3/panasonic-lumix-g-vario-14-140mm-f-3.5-5.6-asph-power-o.i.s.-lens-h-fs14140e-k

Review

Sharpness in the centre of the frame at 14mm and maximum aperture is already excellent, and the clarity toward the edges of the frame approaches very good levels.

14mm

Falloff of illumination towards the edges of the frame is fairly well controlled throughout the zoom range. At 14mm the corners are 1.86 stops darker than the image centre at maximum aperture and at 140mm the corners are 1.58 stops darker.

For a 10x zoom lens, chromatic aberrations are very well controlled throughout the zoom range.

50mm

Distortion is extremely well controlled for such a superzoom lens.

140mm

http://www.ephotozine.com/article/panasonic-lumix-g-vario-14-140mm-f-3-5-5-6-lens-review-22632

http://m43photo.blogspot.ru/2013/08/lumix-g-hd-14-140mm-f35-56-review.html

Hi Guys, I have the older 14-140 mm Lens, but it has a 'spot' (perhaps dust) for a while. The dust spot stays on the same place, even if I zoom in, so I suppose the problems is more near the screwing point of the lens, but it is not on outside glass. Does someone have any idea how I can get rid of it? I use it for video, so photoshopping the dust away, isn't an option. THANKS!

@leprechaun Thanks, but I thought it isn't. The spot doesn't show with different lenses. Someone any idea how to clean a lens?

The lens is very fast to focus on the latest cameras, such as the DMC-GX7 that we tested it on, and the fact that the auto-focus system is virtually silent makes it well-suited to shooting video as well as stills. The MEGA O.I.S. system is very effective when hand-holding the lens. Optically this lens is a good performer.

http://www.photographyblog.com/reviews/panasonic_lumix_g_x_vario_14_140mm_f3_5_5_6_asph_review/

@Vesku: Had til now three of them in my hands - No such problem at all. At least I never recognized such a problem. If you have the chance - Try out another 14-140mm 3.5-5.6 on your GH4 - Then you can be sure, that it´s the lens, the body or the combo of both.

Some observations from:

http://forum.slashcam.de/viewtopic.php?p=658591

Google translations from german

@kgerster:

"Have recently the Panasonic 14-140mm. The main reason for buying was of course the zoom range to extend my 14-42mm. But had hoped for a better stabilization. The 14-42mm is according to Panasonic equipped with a Mega OIS. , the 14-140mm with Power OIS DC doubled compensate for camera shake promises Panasonic. The greater my disappointment when I compared with the 14-42mm. I see no advantage for the 14-140mm. ..... It is virtually impossible from the hand to take video that do not wobble. I do not mean gross wobble. It this fine, unpleasant to be regarded wobble. Especially "vertical rotation". The 14-42mm is there even a little better.Unfortunately. ......Too bad that the stabilizers of camcorders are soooo much better than the built-in lenses.

@sportster:

"I think that compared to the Mega OIS of the Power OIS brings improvements at most in photo mode. For video, the "improvement" cast so that the quite natural-looking large-scale shaking of the entire video image is replaced by a behavior in which individual elements of the subject are indeed stable, but might move against each other dynamically.This leads to an unsteady image impression one might almost be called fibrillation. Perhaps this impression is also created by the limited sampling rate of the sensor........ It only helps a stable support or a tripod. I myself have already tested several Panasonic lenses and have come to the conclusion that me the Mega OIS was better for video. The Power OIS seems to be implemented differently, depending on the main target group of the lens (photographer or videographer). Most striking is the negative video-flicker effect in my opinion just the sharpest and most expensive lens, the 35-100 / 2.8. For this affect the stability of this lens in photo mode phenomenal. Best behave in the video PZ lenses, so the 14-42 PZ and PZ 45-175. Especially the small and lightweight PZ 14-42 produces the quietest video images, even though one would think ought to that larger and heavier lenses in the advantage would be. The new 14-140 lies with its implementation of the Power OIS somewhere in between. The old 14-140 with its Mega OIS produced slightly smoother video recording, ........ the Power OIS effect is barely disturbing due to the wide angle characteristics, but is also visible when one pays close attention.

@AdamT

Thanks for feedback. My 14-140mm could be broken. I hope so. It is so hard to shoot stable video with it. It is stable when I mount it in tripod but that is not the point of stabilization. I must test more - shutter speeds, apertures, holding techniques, breathing....

I downloaded my tests to Vimeo:

https://vimeo.com/user23310531/videos

My new 14-140 lens seems to be broken. Compared to old 14-42 it vibrates very nasty.

What do do think? Is this normal

No FW update for new 14-140

@valpopando

...It is stable when I mount it in tripod but that is not the point of stabilization...

From 5 post earlier :)

I have studied that case of 12-35mm also.