Big, slow and expensive, but probably pretty good at F2.8. It will be interesting to see how it performs at medium telephoto as there aren't a lot of choices at 60mm. The sweet spot of the Olly 45-150 zoom is right around 60-75--1 blur unit--so it better be pretty sharp.

Two good reviews of the lens :

• Robin Wong : http://robinwong.blogspot.fr/2012/09/olympus-mzuiko-60mm-f28-macro-review.html

• Ming Thein : http://blog.mingthein.com/2012/09/21/olympus-60-2-8-macro/

A nice lens:

I use the Contax Zeiss 60mm f2.8 Makro-Planar, and I must say it is quite out of this world

http://www.photoreview.com.au/reviews/lenses/m4-3/olympus-m.zuiko-digital-ed-60mm-f-2.8-macro-lens

http://www.pekkapotka.com/journal/2012/10/18/olympus-m-zuiko-60mm-f28-macro.html

http://www.smallcamerabigpicture.com/first-look-olympus-60mm-macro-lens/

Some samples

http://www.photographyblog.com/previews/olympus_m_zuiko_digital_60mm_f_28_macro_photos/

I really like this lens. For one it iss watherproof and functions as a great general purpose lens in bad weather conditions and secondly it is a wonderful macro lens. I used to shoot macro with a macro converter put in front of my tele lenses but the results this dedicated macro lens delivers are outstanding and play in a differen league than my macro converter. I have not tested the other dedicated macro lens for mFT the Panasonic 45mm lens but based on other reviews the working distance is shorter due to the shorter focal lenght of 45mm. With the Olympus lens it is roughly 9 cm which is very good if you want to shoot insects and try not to chase them away.

http://www.johnsson-photography.com/reviews/olympus-60-mm-m-zuiko-macro/

http://lepidi-photo.blogspot.fr/2013/04/test-de-lolympus-60-mm-f28-macro-ed-msc.html

https://www.flickr.com/photos/princecody/sets/72157643485442675/

https://www.flickr.com/photos/princecody/14862757185/in/photostream/