Ever since I first started on this forum I have been reading about the 20mm f1.7. I have the Olympus 17mm and liked it, but eventually decided I really wanted a faster lens. It was time to try the 20mm. It arrived yesterday and I am blown away: I took a walk around the neighborhood today . . . Stopped at the church . . . Went to get my mail . . . Took a look around . . . and saw some interesting things. I love this lens!! I suspect this is all I'll be using on my E-P1 for a while.