7-14 is great for interior and tight situations. Extreme end not advised to include people at the edge. Great for 16:9 ratio to take panoramic-like photos. I do not need fast aperture like 12/2.0 as my composition is rather slow. With EM-5 there is IBIS so 12/2.0 is not my cup of tea. Then again, there are people who do not need 7mm wide. Basically, different choices available for us users for m43. Not sure about other systems if they can boost such lens range at this moment.
DSLR have similar solutions like the Sigma 12-24 (35mm format), Tokina 12-24 (APS-C), Nikon 14-28 (35mm) and Olympus 7-14 (FourThird). This lens is a bit heavy (300g) compared to the rest of the lens. Second hand prices about 1k to 1.1k depending on condition. I got a good second hand set. The only new lens I have are the 12-50, 14-42x and 45/1.8. The 100-300, 7-14 and 20/1.7 I buy second hand.