Sigma 24-70mm dg os 2.8 ART vs Canon

[clogs]

By far my most used lens is the Canon 24-70 2.8L (mki). I haven't upgraded to the mkii as I didn't see a enough difference to justify the cost. In any case the mki is built well and handles great, the one thing I would consider upgrading for is image stabilization!
I heard there is an IS version of this lens on it's way from Canon..however I anticipate this will cost an arm and a leg when it hits the shelves.
So now I've been looking at Sigma's 24-70 2.8 optically stabilizied ART lens as a possible candidate to replace the old Canon lens.
I'm not familiar with Sigma lenses, but I only heard good things about its ART range, so was wondering if anyone has any experience with this particular lens? At £1200 it looks good value, but how does it compare to the L series build and image quality? Is it worth the money or shall I wait to see what Canon has in store?

I know Tamron has an image stabilized version as well, but I don't particularly like its build quality over the Canon, though its price is very good. In any case the Sigma looks more like it could match the L lens in quality?

 

[Kell]

Funnily enough I've just bought the Tamron over and above the Sigma due to the reviews. they all seem to suggest that the Canon is the best, then the Tamron, then the Sigma.

Can't tell you what it's like yet as it hasn't arrived.

 

[Brazo]

Have you tried the Tamron G2 version? All metal build quality is fantastic.signa dropped the ball a bit with this zoom lens. It disappointed compared to the competition.

 

[clogs]

Aha, no I haven't seen this G2 version...silly me!
I just had a look, certainly different to the other Tamrons. Seems it's similar price to the Sigma.

Thanks for the heads up, I'll have a closer look at this lens.