I was pining for the FA* 24mm f/2 for a long time, but couldn't justify the $700 or so it cost (used). When Microsoft was offering their eBay rebates I bought the 31 Ltd new for less than the FA* 24 used, which made sense at the time. 31mm was (and still is) a bit too long for what I wanted, but it's a fantastic lens in every respect.
About 2-3 weeks after I bought the 31 Ltd the economy took a nosedive and I started seeing FA* 24s on eBay for as low as $450. I was quite annoyed as I would definitely have bought one at that price if I hadn't spent 50% more already on the 31 Ltd.
That's my sad story
On the plus side, I then bought an FA 20mm f/2.8 to get a compact, wide lens. There is nothing better in Life than justified LBA