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These are both good lenses, but I find the 50L's AF to be a great deal faster than the 85LII. However, because they are such different focal lengths, the results have different qualities. The 85L works nicely at intermediate and close work, while I often think the 50L shines in only very close quarters. Both lenses will give subjects a '3D' look, but the 85L does it better than the 50L. Nevertheless, I find the 50L to be the most practical prime in my bag, so it tends to be my most used lens.