I recently picked up a GM1 with 12-32mm kit lens. Since i have the Panasonic 14mm f2.5 I decided to do a quick n dirty IQ test at 14mm. I'm very surprised that the lenses are about on par at 3.5 (14mm) and 3.7mm (12-32mm) and at f5.6 (for both). For my test I focused on the dragons eye. Here's the original with the 14mm at f3.5. For pixel peepers all the images can be seen here: https://www.flickr.com/photos/donscreation/sets/72157656562076668 12-32mm f3-7 14mm by Michael Wolf, on Flickr Crops at 14mm, 12-32mm f3.7 on left, 14mm f3.5 on right at 14mm f3-7 n f3-5 by Michael Wolf, on Flickr Crops at 14mm, 12-32mm f5.6 on left, 14mm f5.6 on right at 14mm f5-6 by Michael Wolf, on Flickr Other than bokeh and low light performance the 12-32mm looks as good as the 14mm (to my eye). The 12-32mm at 14mm does appear a bit wider than the 14mm. Focus speed on both (with GM1) are on par also. Since I have a Panasonic 20mm f1.7, i thinki i may sell the 14mm.