I agree. Those prices are insane. As I mentioned in my Sigma article, it is interesting to me that they have not had to raise their prices with the same abandon. I am so very pleased with my Sigma 120-300 F2.8. I AM thinking that I may someday pick up the Sigma 500, when they update it with the OS. That will still be about a 3rd of the cost - all for 1/2 stop of light...and from what I have seen, razor sharp.