M.Zuiko ED 9-18mm f4.0-5.6 (Black)

I have had this lens for a month now, and used it with an EM-5. My results have been great. Images come out sharp and contrasty.

I like using the "Sepia" setting of the Art Filters in the EM-5, and shooting railroad scenes, getting close enough to get the dramatic perspective affects... results have been really stunning!

The price is a bit high, but the results obtained with this lens makes it well worth the cost. Colors come out rich and pure when shooting in normal modes, and (as other people have stated) the lens is light weight, compact, and easy to use.

I am happy I got this lens, and I recommend it to anyone shooting the Pen or OMD EM-5 Cameras.

I did side-by-side with the another MFT lens and found the other one to be fractionally sharper, but stayed with this lens as the difference was not sufficient enough in regular use. Size is the killer app here. I read so many reviews of people with larger DSLR's who missed shots because they didn't carry the camera. Not an issue here.
I so love this lens it's opened up new angles (literally!) of shooting. It's tiny, size of baby food jar. Frankly it's far better than it has a right to be considering the size, the laws of physics and the quality. I shoot at ISO 1600 and 3200 and with the lens, yes grain is there, but the super-wide lessens the apparent appearance.
I'm now looking for a second body becasue I always want to have this lens mounted. I use it too much.
Modern software can straighten the curves with ease in super wide mode.

I'm too old to lug a 6x17 to the top of a mountain anymore. But I still want to capture the wide mountain vistas. This lens provides that in a light and compact package.

With power comes responsibility, distortion is present and must be managed. Careless shots may well look ridiculous.

I have evolved through all of the Pen cameras starting with the EP-1 to the EP-3 (my favorite to date). I am a contractor often working in confined spaces and this lens does a wonderful job...in fact my web designer wondered where I got such beautiful photos. The wide angle doesn't distort to the point of changing the photo (I know in some cases, this is desirable). Pictures are sharp, colors are great and I am able to show off my work better than anyone else.

I purchased this lens to be paired with my e-P1 for mostly landscape and architectural photography and couldn't be happier. For an ultra-wide angle zoom the body of the lens in incredibly compact, especially when retracted. It feels so natural on the PEN system and offers wonderful capability for the price.
Granted, the lens is not super sharp in low light situations but it manages distortion well and can help create some breathtaking photographs. Would definitely make this purchase again.