[thxbb12]

I'll take the Canon, thanks.

 

Much cheaper, MUCH smaller and lighter, much better resale value if needed. 

 

I wouldn't call the Canon much smaller: same length and 1cm less thick:

• Sigma: 9.14 x 11.49 cm
  
• Canon: 8.13 x 11.18 cm
  

The Sigma is quite a bit heavier however: 1130g vs 750g

 

At $1400 vs $1000 the Sigma is 30% more expensive. Considering it's just been released, its larger aperture and the much better IQ, I think a 30% premium is well justified.