Might be cheaper then the 60mm. But I had the Sigma 30mm, sold it, thought it was to far zoomed in or something. Turns out, it wasn't zoomed in enough. Sigma doesn't make a 40mm lens, for micro four thirds.
Funny, I sold a Panasonic 25mm to Amazon, think it's 25mm, ended up rebuying it. Should rebuy the Sigma 30mm, it's cheaper then the 60.