I have noticed lately that the Canon 35L 1.4 has really dropped in price on the used market. I know the new Sigma is getting great reviews, but has it's release really killed the value of the 35L that much? I picked my 35L up a few years ago for $1200 used. Not cheap but it was a fair price and around what they were selling for at the time. That level stayed pretty steady. I just saw one sell here for $850! I have seen many others lately selling for under $1000. It's still a great lens without any focus issues, but values seem to have plummeted since the Sigma came out. So much for this particular lens, which is a very nice lens might I add, holding it's value.
The Canon 24-105 is another victim. I know it's a kit lens, but this was a lens you could sell for $900-$950 not long ago. It sells for way less now. So much so that I do not see the point of selling mine.
Are we seeing a trend? What other lenses will third party makers release which will lead to the Canon equivalent dropping in value?