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I agree with this. I've used the 50 mm 1.8 and 50mm 1.4 on my T3i. I use both. The later is a sharper lens and a significant improvement over the 1.8 and is well worth the $200 difference. Now when you talk of Canon 50mm 1.2, it's $900 plus. In that range you could buy a used full frame camera like the 6D from eBay.If you have a T3i stick with the f1.8 or f1.4. There is no reason to get the 1.2. Save the difference and get other gear or use it towards a new camera.
50 @f1.2 x1.6 crop => a unique in-camera dreamy effect added to every photo
however, if you want to own a 50mm lens, many would recommend sigma 50 f1.4 art for its obvious sharpness when wide open.
50 f1.2 is very different from Canon's f1.4 or f1.8 versions, is probably the smallest lightest L lens, and is almost completely weather sealed. Sigma's f1.4 art is bigger, heavier, and sharper (at same aperture) than 50 f1.2.