This Sigma is the equivalent of what I had really wanted when I bought the 28mm f/1.8. I like the 28, but this appears to be a good step up.

My question is about the used market for Sigma lenses. If someone drops $900 on the Sigma today what would you think it's used value would be 6 months to a year from now assuming it was well taken care of? Will it drop like a rock because it's a 3rd party non-Zeiss lens or would it hold its value much better because the lens is so well received and popular?

Thanks
Dave