Ryan Brenizer's Amazon Blog: Is the new Sigma 50mm the un-50mm? Permalink

Something weird is going on. When Sigma first announced the new 50mm f/1.4, I expected it to be smaller and cheaper than their 30mm f/1.4. Why? In 35mm world, 50mm lenses are *always* smaller and cheaper than fast wide-angle lenses — even when the 50mm lenses cover a full 35mm frame. It’s owed partially to the relatively simple glass arrangement that most 50s have been using since they became standard.
I was wrong. At this moment, the 50mm is more expensive, but that could make sense because it’s a new lens, and may see discounts from retail price upon release. What makes very little sense at first glance is that it’s huge. At 505 grams, it’s almost twice as heavy as the Nikon 50mm, and it takes 77mm filters — the same size as, say, 70-200mm f/2.8 lenses.

Check it out here.