Everyone has a preference when it comes selecting primes. Some like it wide, some like it tight. I tried but never been able to bond with the 35mm equivalent. 40mm equivalent on the other hand feels perfect, almost fits like a glove. Anyway, because of some logistics problems, I could get the 20 mm just recently, and that is after getting the PL 15mm, P25mm and P42.5mm all f1.7 primes. Since this is a mature (let's not use the term "old") lens, there are many reviews around. People like it for the size and the rendering, but are not happy with the focusing speed. So today I decided to push the limits of the lens and chased the dogs in the backyard, to see if I can keep up with them. Let's see some results first, and then I will share my experience and insights Subscribe to see EXIF info for this image (if available) After trying to lick my camera, I told him that what he did was not OK. He is apologizing for his behavior. Subscribe to see EXIF info for this image (if available) She is still suspicious. "is it (the camera) a toy or what ?" Subscribe to see EXIF info for this image (if available) Subscribe to see EXIF info for this image (if available) For this kind of work, weather proofing is a must ! Subscribe to see EXIF info for this image (if available) She wants a pose from her good side Subscribe to see EXIF info for this image (if available) I know that this is an extreme and demanding case. (Ultra) fast moving subjects like these monkies require very fast AF and a good shutter discipline. As expected, both my skills and my equipment (GX9+20mm) are not the best for this job, so my keeper rate was a little bit low. Plus the fov is not right for capturing dogs anyways. It is too tight when they are playing around. The color reproduction of the lens is OK. In the same ballpark as the P25mm f1.7, and obviously behind the PL 15mm. Unfortunately the images didn't respond well to different picture styles. But the clarity and the level of details is just right. I can see why this is an excellent B&W lens where you don't need (vibrant) colors. The lens is so small that you can't grip the camera with your left hand. I am not complaining but this is something I am used to, hold the camera from the lens if I need to use my right hand. In this particular situation, like animals and small children, PL 15mm is a better option because it's faster and wider. If accurate color reproduction is desired, again PL 15mm is more suitable. For any other scenario, which is 95% of what I shoot, the 20mm is a great tool. Fast (enough), small, light and produce very nice images.