I can't think of a reason that I might would want the f/2.8, certainly not enough to justify the extra size and weight, even ignoring the extra money.
Most of the time I'm going to stop the lens down somewhat anyway. The exception is the crape myrtle blossoms pictured above. Even at 16mm and f/4, you can get a blurry background when close to the subject. With the quality sensors can give now at high ISOs and IS allowing for slower shutter speeds, I am unlikely ever to miss the extra stop, and I'm glad to miss the extra weight all the time.
Most of the time I'm going to stop the lens down somewhat anyway. The exception is the crape myrtle blossoms pictured above. Even at 16mm and f/4, you can get a blurry background when close to the subject. With the quality sensors can give now at high ISOs and IS allowing for slower shutter speeds, I am unlikely ever to miss the extra stop, and I'm glad to miss the extra weight all the time.
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