By our tests, the new Olympus 12-40mm f/2.8 delivers some very impressive results, particularly in terms of sharpness and distortion. Handling and build quality is fantastic as well. The lens features an all-metal construction that feels solid. While it’s larger than your typical Micro Four Thirds lens, it’s still much more compact than most full-size 24-70mm f/2.8 zooms geared for DSLRs. Nonetheless, it’s still a lightweight, balanced lens that pairs nicely with both the larger Olympus E-M1 as well as with smaller bodies such as the Panasonic GX1 we use in our test lab.