The more I look at the WA options for Sony APS-C the more I am realized that I would likely be happier with and adapted 17/18/20/21 instead. I prefer adapted lenses, I have had great luck with my various Nikkors, Minoltas, Konicas etc. and neither the Sigma 19 nor the Sony 20 is exactly inspiring me to go out and pick one up. The Sigma 19/2.8 is certainly then best "bang for the buck" and I'm sure they're both nice lenses but given the choice a decent old MF lens is really more my speed. I might still end up with the Sigma or the Sony but I wanted to explore this a bit more before I decide. In looking at lenses like the Nikkor 20/3.5, Canon FD 20/2.8 and Olympus OM 21/3.5 I think any of them might work out fine. When I use a WA lens it's primarily for walking around touristy kinds of shots and the vast majority of the time it's at F8 or F11 so MF is likely not going to be an issue anyway. The other considerations is that you can pick up a lens like the Canon FD 20/2.8 pretty reasonably if you're patient. Currently the widest I have is a Nikkor N 24/2.8 and Minolta MC 24/2.8. On APS-C that gives me a widish-normal 36mm and I can make that work but on Fuji I really liked shooting the 18/2. I found I really enjoyed shooting 28mm FF equivalent (there has GOT to be a better way to say that). What are some of your favorite WA lenses that you think are worth looking at?