Upload & Sell: On
I have not tried the 24, but my relatively beat-up copy of the 17/3.5 produces very, very good results. As Paul said, it needs to be stopped down to f8 (f11, ideally) for sharp corners, but they certainly do get sharp enough. From sample images I have seen around here, it is as good as the Zuiko 18/3.5. Or, rather, I have never seen evidence that the Zuiko 18/3.5 is any better in the corners.