There are several reasons I like this lens when paired with the E-PL5. The main thing is that the lens is tiny. It makes it easy to pop the camera, with lens, in a Scottevest Jacket and it is barely noticeable. The second feature that I like is the f1.7 aperture. This makes it my "go to" lens for taking pics in the house. Sure, I can get great performance from my Canon 5D Mark III with a 50mm lens, but it would need more space on my already crowded table top area by my seat on the couch. I have the E-PL5 with lens attached sitting in a magazine rack and it takes up very little space. Thirdly, the 20mm (40mm equivalent) is pretty much perfect for getting pics in a tight space.
I own the original 20mm, but they have updated to version 2. The new version has a bit better build quality and is supposed to have some slight benefit in picture quality. However, it doesn't sound like enough reason to go through the process of selling my current lens.
Below are a few samples of pics with the lens. All of them are edited, so these aren't the out of camera samples. There are plenty of sites that offer that type of info if you are interested.