Really always comes down to, if it's too good to be true, it probably is. The fact is, if a store is offering bodies/lenses at 20% or more off what everybody else is, there is probably something fishy
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A lot of us help high hopes for this lens, but alas it has failed to deliver. On the Photozone test vignetting was so bad it was even apparant at f/8! Resolution fall off at the borders & corners is also particularly bad, even the Bokeh was criticised.
The Canon version is by no means perfect, with its field curvature issues, and especially with a new one rumoured for so long.
By far the worst part of the Sigma offering is the price at Â£650 it just doesn't offer enough of a saving over the Â£1000 the Canon costs, and then there's the second user market where prices are quite a bit less.
If you can get another 6 months out of the current lens then I'd say it'd be better than trying to make a choice at the present time.
There's just too much money involved with high MP... You're forgetting that storage is cheap but also Canon and Nikon are pushing the envelope on what film could even resolve and produce. 10 years ago it would have been a photographers wet dream to be able to take a 35mm camera body and lens and pump out 16x20's and even larger and not have it look soft and grainy. Now we can do that without batting an eye. If you dont need it, dont use it and downsize or shoot at a lower setting. Like fast primes, I would rather have them and not need them rather than need them and not have them...