I've had the 20mm for a week now and I'm just not bonding with it. I'm used to a Sigma 30mm on 1.6x crop (48mm eq.) and this 20mm feels "off". Taking some indoor portraits with it, I was having trouble avoiding perspective distortion stretching. And then taking it to a party, it felt like it wasn't quite wide enough to be terribly useful indoors for environmental candids or groups. It's like I have all the drawbacks of wide angle with none of the benefits. Lens is sharp and I love the pancake design. The used price was excellent. I really want to like this lens! Maybe I should give it more time? Kind of regretting choosing it over the Oly 25mm right now, though.