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Old 12-10-2013, 09:38 AM
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naskies (Dave)
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Join Date: Jul 2011
Location: Brisbane
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The Digital Picture has an extensive database of test charts shot with virtually all Canon lenses under identical conditions. Here's a comparison of the two you're looking at on a full-frame camera at f/2.8:

http://www.the-digital-picture.com/R...mp=0&APIComp=2

You'll notice that below f/2.8 both have nasty aberrations even with black lines on white background - stars will be horrible.

The two lenses are worlds apart in build quality, focusing speed, manual focusability, and bokeh (background blur - very harsh on the f/1.8). The f/1.8 version is popular primarily because it's cheap and provides great value - image quality and f-ratio that normally costs many, many times its price.
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