best way to compare 2 lenses?

So I got my new Sigma 24-60, and I want to make sure 100% that I want to get rid of the 17-85.

Wondering if there are certain things that are best to shoot? So far I've shot a fish food container (orange fish with blue background, small text for sharpness comparison) I'm just wondering if the round shape of the container could be bad for focusing? I have my tripod locked in all positions, and I've been swapping the lenses without moving anything. I'm shooting in JPG so that everything is exactly the same.

So far the Sigma is WHOOPING the Canon. Also, the Canon is wider by a few mm. Strange. I just want to make the most accurate tests before I post a writeup.

I find my Sigma 24-70 wipes the floor with my current list and find it has come as close as its Canon counterpart minus HSM and sealing.

I was lucky enough for a friend to drop off off his Canon and took a few portraits with both and then tried my 50 1.8 and the Sigma was holding up very well. As it turns out, I kept it and never look back. Great thing, will pop straight on a 5D.

I have the 17-85 and wouldn't part with it. I did some simple test to compare it to some other lenses. You can see the results at http://ourmnacres.us/s​harpness.html

Arvid

oldradioman wrote in post #5316337
I have the 17-85 and wouldn't part with it. I did some simple test to compare it to some other lenses. You can see the results at http://ourmnacres.us/s​harpness.html

Arvid

Cool, I am going to try that next.

Don't get me wrong- I like the 17-85 and it's reach. It will be hard to let it go, but so far it looks that I will be. I wish I had a 24-105 f/4L on a 5D or 1Dxx FF.. seems to be the closest range to the 17-85 but with better quality.