Do you mean sharpness? Cause having it at 1.8 kind of has the opposite effect of sharp. If you want the sharpest out of a lens, you're going to want to at like f/8 or 5.6 or so. You can read the MTF charts to figure that out if you want. But that doesn't mean you can crank it up to like 32 and have something super sharp, sharpness degrades as you go that far, even though DOF becomes wider.
I wish I had a 1.4 lens, the canon 50mm looks pretty nice. That and some delta 3200 would be amazing in the subways of NY!
I guess I just include pictures with ym posts. I wanted to try a TV of 1/8000 so I shot this, it's even beach themed to get us all pumped for summer. And on that note, I had a snow day today.