Equally everyone seems to agree on the cons.1/Price 2/No hood 3/Soft edges and some CA (particularly full frame).Well the lack of hood is a perennial beef with Canon and the price is not too dissimiliar with the Sigma and for a lens of high build quality and USM, that seems reasonable value for money to me.Which leaves the soft edges and CA-- on a superwide prime-- pretty much to be expected and e