I have not tried this lens and judging by all the reviews I’ve read it is a very good but not outstanding lens. Now if you are a working pro that needs a wide-angle with a fast aperture this is certainly the lens to have. But for the rest of us mere mortals and M4/3 fans this lens does not make a lot of sense.
Why do I say this you may ask? Well, the main reason most of us joined the M4/3 system is for its compact size, light weight and affordability. Now this lens isn’t very big by FF DSLR standards but is 2.5 times the bulk (270 cm3 vs 106 cm3), 2.5 times the weight (330g vs 130g) and nearly two times the price of the excellent M.Zuiko 12mm f/2.0. It is also more expensive and nearly as large and heavy as the superb and much more practical M.Zuiko 7-14mm f/2.8 PRO zoom which is also weather-sealed.
So given that I plan to stick mostly with small primes, I will be buying the M.Zuiko 12mm. But if I decided to spring that kind of money on a new wide-angle lens, I would most likely go for the 7-14mm f/2.8 PRO zoom. Nonetheless, I am quite happy that this lens is available as it provides one more option for the pros or whomever has a special need for such a fast and high quality wide-angle. It makes the M4/3 system more complete and attractive and that’s good for all of us.