The Best Bang For Your Buck – The “Nifty-Fifty”
I would say that if you are just starting out and you want a 50mm prime lens, get the Canon 50mm f/1.8 II. At around $125, the 50mm 1.8 is a real bargain and it can do 95% of what the 50mm 1.4 can.
The One to Avoid – The “Shifty Fifty”
It goes without saying that the Canon 50mm f/1.4 is simply not worth the 3-4x cost of the 50mm f/1.8.
Even though it has a maximum aperture of f/1.4, its overly soft image quality at wide open nullifies that extra half stop advantage. And if you stop down to f/1.8 or f/2.0, then there really not enough aesthetic difference in appearance to the 50mm f/1.8.
The Best Overall 50mm Lens – The “Gimme! Fifty”
The Canon 50mm f/1.2L is without a doubt the best 50mm prime lens from Canon. When you want a 50mm for low light, for ultra low depth of field, and for shots that you would not be able to get otherwise from the other 50’s, then save up your money, skip the 50mm 1.4 and just jump straight to the Canon 50mm f/1.2L.
At around $1600 bucks, it is far more expensive than the other two 50mm primes, but at least it does a lot more as well. It is actually sharp and usable when wide open and it can open up a full stop brighter than the 1.8. This prime lens gives you more creamy bokeh and just more bokeh in general
http://www.slrlounge.com/school/canon-50mm-prime/
http://kenrockwell.com/canon/comparison ... lenses.htm
DxO
Lab report
Starting with overall scores, the f/1.8 scored two points higher than the f/1.4. Chromatic aberrations were lower on the f/1.8 although the actual resolution was 63 lp/mm for the f/1.4 and 59 lp/mm for the f/1.8. In vignetting, chromatic aberrations, light transmission and distortion, the 50mm f/1.8 edged out the 50mm f/1.4.
http://www.adorama.com/alc/0012817/arti ... f18-or-f14
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