Excerpt: I read great things about this lens, so I got a used one on eBay. I thought that it would have considerably better resolution and clairty than my current 14-45mm zoom lens. I took test photos from both lenses, with the zoom lens set at 25 mm. And both lenses were set in the neighborhood of f/4.
Excerpt: My primary weapon is my E-M1 with grip loaded with either the 12-40 F2.8 or my new behemoth 40-150 F2.8. But I also carry an E-M5 loaded with a prime lens for targets of opportunity at weddings and indoor events. For all things indoor natural light, this lens is my goto glass.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction, The Bomb
Excerpt: Perfect match to my Olympus E M5. Fast, accurate focus in high and low light. Clean, lovely images at all apertures. The Olympus lens stabilisation and the low light performance of the Summilux are a fantasy to this old shooter who grew up pushing Tri-X and shooting the Leica at 1/15.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Lovely images, Nice Bokeh, Rugged
Excerpt: After purchased both LEICA 15mm and 42.5mm I thought I did complete the collection by getting a 25mm. My first impression was "where is the aperture ring?" I then realized that this lens has an older design so it doesn't have one.
Pros: 30cm Min Focus Distance, Nice Bokeh
Cons: 03m Min Focus Distance, Color Shifting, Older Design, Slow Focus
Excerpt: I purchased this lens when I purchased a GH4 (see "The Mighty Mirrorless" review). I am glad to say that this is a great companion for the M4/3s GH4. From the photography side, this lens is very fast and very sharp.
Pros: Compact, Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction, Very Sharp