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Canon EF 17-40mm f/4L USM

ef17-40_4l_1_
Review Date: Sep 17, 2008 Recommend? yes | Price paid: $560.00 | Rating: 10 

 
Pros: L-quality, price, sharpness, contrast
Cons:
Corner sharpness, not really good for portrait

This is a great landscape lens with good sharpness and contrast. I've used it on a XTi and a 5D. It's good on XTi and great on 5D. It's sharper from 20mm -35mm than 17-20mm. But you will not use 17-24 range very often on a full frame. The corner is not as sharp but acceptable. Overall, great lens for only $500-600.

 
Canon EF 24-70mm f/2.8L USM

ef_24-70_28u_1_
Review Date: Sep 6, 2008 Recommend? yes | Price paid: Not Indicated | Rating: 10 

 
Pros: Sharp wide open, nice boken, fast focus, good build
Cons:
a little bit heavy, not performing as well from 24mm-28mm

I've had 3 copies of 24-70L, 2 copies of 24-105L and 1 copy of 17-55 IS. I've done some comparison. 24-70L won easily over 24-105L on both 40D and 5D. 24-70L/5D is also better than 17-55 IS/40D. This is a nice zoom lens, sharp at 2.8, nice color and contrast. I definitely recommend it.

The downside is that it's not a good landscape lens, and it's a little heavy.