[mst]

http://www.clubic.com/shopping-959842-3-...canon.html .....576€ delivered.

That doesn't look like a really representative source to me. They claim to be based in "Hong Kong - Singapore - London", so this is most likely someone who profits from special tax regulations.

For a customer this usually means: dirt cheap, but no warranty, since they very likely sell grey market stock.

So, the real street price is quite a bit higher.

Regarding your other statements: I haven't touched the Tamron VC primes, yet, so I can't comment about their quality. The Sigma f/1.4 lenses are no doubt impressive, but also terribly heavy. A collection of Art primes looks tempting performance-wise, less so if you have to carry the weight on your back or shoulder.

-- Markus