I just took delivery of the 20/1.7 and while I love the size and cost of the lens, the AF speed leaves something to be desired. I'm a little surprised at the slowness, it reminds me a lot of the Canon 100L macro and in some quick and dirty speed tests, my X100 actually focuses faster and more deliberately in poor light (read: 1/60, 3200ISO, f/2). I also have the 12-50EZ kit lens, which focuses very quickly. How is the PL25 in comparison to the zoom? I know it's quicker than the pancake, but I'm looking for a comparison to the zoom for context.