Upload & Sell: Off
As much as I'm excited to see new Sigma glass- this is one tough cookie to understand. I mean, who is this lens for? What market segment?
For those of us with the 24-105L, we understand that it is one of the best all-around lenses on the market- and it's ~$600 price in a kit is outright unbeatable. Further, the Sigma is going to be heavier and larger- both advantages to Canon in a walk-around/utility lens- and the Canon is weather-sealed, with very good AF speed, accuracy, and consistency.
So what does this Sigma bring to the table? We can surely expect...Show more →
You know not every photographer cares about price. If this lens indeed has better IQ than the Canon than I'd pay double what they are asking.
I go out of my way to purchase a large number copies for each lens I get and keep the best one and I have not had a single problem with Sigma's autofocus in their newer lenses. Not a single problem out of 12 copies (4 each) purchased of the 18-35mm f/1.8, 35mm f/1.4 and 85mm f/1.4. I've also purchased a used Sigma 85mm f/1.4 to test it out before buying new and it had focusing issues, but only because it had the older version of the autofocus chip. When I had the newer autofocus chip installed after talking to Sigma's representatives as part of reselling the lens, all the autofocus issues went away. Sigma does not have autofocus issues in their newer lenses, period. Out of 13 copies tested with the newer autofocus chips, none had the slightest issues, and each focused with pinpoint accuracy every single time.
The Canon 24-70mm/4L IS delivers image quality that is extremely poor around 50mm, it's so bad at this range that overall when I tested a copy against my 24-105mm the newer lens actually had worse overall image quality (although I figured out after talking to reviewers with more copies that my 24-105mm was a good version and the 24-70mm was slightly below average).
The Tamron 24-70mm VC is a nice lens, but here we are comparing a 24-105mm lens vs a 24-70mm lens, there is a big difference. I have a large collection of very high quality primes, and I still use the 24-105mm most often on my body because of it's flexibility. I have a Canon 24-70mm f/2.8 II, and still this happens. So what is most important is flexibility and image quality and if Sigma can help me improve one or the other without a tradeoff, then I'm sold.