Wow, that was unexpected. And sorely needed, too. Sigma has announced a 50-100mm f/1.8 Art Lens for cropped sensors (DX, in Nikon lingo). Oh, Nikon, Nikon... These are the kinds of lenses you ought to be producing.
Today's article is neither a review (obviously enough) nor a speculative review (how can you be speculative about something that has been officially announced?) but it is the starting point of a conversation about scope.
The title above is indicative. This is a prime killer lens, no questions about it - provided that the optical quality is worthy of the 'Art' designation. The 18-35 f/1.8 was excellent, so one should be hopeful about it. Here's a list of the primes this lens renders irrelevant (sort of):
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