While I shoot Nikon, and not trying to start a debate here between brands, this sounds like more of an f/stop question than anything else. I have a Nikkor 85mm D 1.8, and I haven't found a need myself to go below that in the time I've had it. I don't see the point of spending the extra money for a feature that you won't need. But if you feel that you need that bit of an increase of speed on a regular basis, I say go for it.
Isaiah
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I know that I am one with beauty, And that my comrades are one. Let our souls be mountains, Let our spirtis be stars, Let our hearts be worlds.
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