Title: Not worth the extra vs 50mm f1.8
Review: I own 50mm f1.8 and this 50mm f1.4. The f1.4 is not worth in price if f1.8 is existing.Many test were performed personally. The f1.4 time to focus is not better than f1.8 (almost same time); the IQs are almost the same; f1.4 is much heavier; f1.4 has slightly better in color, higher built quality and silent focus.For those pros in f1.4 are not my favorite to count on lense. Many reviews mention this lense is not advanced than f1.8 (I hope read them early). I recommended to buy f1.8 and save the extra. Good luck.
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