The Canon L lenses are much more expensive and presumably much better quality than non-L lenses. What makes an "L" lens? How much better are they over a similar length/speed "ordinary" canon lenses?
Answer
According to Canon, L lenses contain all their best technologies like ultrasonic focusing motors, florite and aspherical lens elements for best optical performance, and are built to survive being used by the pro photographers. Many times this also means sealing against dust and humidity.
Let's take these two lenses:
In this case, the L version is much better built, 50% heavier, with better image stabilizer, more sophisticated optical construction, weather sealing, ring-type USM with full-time manual (consumer version has just micro-USM motor). Optically the L version performs better than the non-L, but not as good as EF 70-200 f/4 L IS, and nowhere as good as €400 EF-S 60mm macro lens.
Additionally, the L telephoto lenses are white, which is meant to reduce chance its insides overheat on the sun as well as tell everyone around you have a Canon L lens.
Overall: L lens will be heavier, optically and mechanically better, and more expensive than similar non-L lens. This does not mean it will outperform everything else regardless of lens type.
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