CameraLabs tested the new Leica 8-18mm MFT lens:
The Leica may not be quite as sharp in the corners as the Olympus 7-14mm at wide apertures and it also lacks the constant f2.8 focal ratio, but in turn it’s smaller, lighter and cheaper. It also out-performs the older Lumix 7-14mm f4, while mostly avoiding the purple flare issues of that model. Throw in quick and quiet focusing, and a weather-sealed body with smooth focus and zoom rings and you have a lens that’s easy to highly recommend. It’s become my favourite ultra-wide zoom for Panasonic and Olympus bodies, and a tempting upgrade for owners of the Lumix 7-14mm f4 or Olympus 9-18mm.