If you don't know what you're talking about, don't review products, especially if you claim to have a high level of tech knowledge. Earwigy's criticism that the "depth of field is pretty bad" is a ludicrous statement. Without picking hairs, all f/1.4 lenses will have the same depth of field.

Relatively inexpensive, extremely fast prime; Autofocus is internal, pretty fast, and quiet; A little soft wide open, but sharpens up quickly as you stop down; Nice bokeh

A little soft wide open; If you upgrade to full frame, the lens is usless

This is one of my favorite lenses!! I love how fast the lens is and how close you can get to things. The images are amazing!!

I bought this lens with the intention of photography active toddlers and doing some night shots. It delivers that and more. Images are very pleasing and same with the bokeh. It's my favourite prime so far (tried Canon's 50mm f/1.4) and highly recommend it.

This is a very nice lens for the price. Heaps cheaper than a nikon comparable product, nice and sturdy and produces nice bokeh at open aperture.

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If you change lenses frequently (as I do) and happen to put this one back in your bag without first attaching the rear lens cap, the rear glass is very easy to scratch as the glass protrudes beyond the lens mount when lens is set to infinity.

Captures nice images

Fatal design flaw

The Sigma 30mm F1.4 EX DC HSM ($690 list) is the APS-C version of the classic fast 50mm lens that, before the popularity of zoom lenses, was the standard lens paired with 35mm SLRs.

Fast aperture; Available for many camera systems

Expensive; Soft images; Noticeable distortion

I bought this recently because I wanted a 50mm equivalent for my Canon 40D. It was either this or the Samyang 35mm 1.4 for video, but since I was a photography guy first, I just the Sigma with its AF. Bokeh is okay. There is distortion. I also have the Canon 50mm 1.8 that I used to use more often.

Fast aperture; semi fast focusing for my needs; sharp

Soft wide open; smallest aperture is f16

*UPDATE* My latest music video was shot with the Canon 50mm 1.8 and Sigma 30mm 1.4. The 30mm was primarily used for most shots except when it was focused closer to the artist's face (50mm used there). Recorded with a Canon 60D at ISO 3200 at 1.4 most of the time, this lens saved the night for sure!

Fast aperture; semi fast focusing for my needs; sharp

Soft wide open; smallest aperture is f16

Recently, I've bought this lens to augment the quality of photos and till yet I haven't found any issues as such!