You have a Sigma 30mm f/1.4, right? Why not Canon 50mm f/1.4? Was focal length the biggest deciding factor? I’m considering the 50mm f/1.4 and wanted to get your viewpoint.
Thanks for asking, Chris! I figured it be more helpful to post my answer here for all to see.
I wanted a lens that got close to representing the field of view from the human eye (50mm). On my Canon EOS 40D cameara, with a 1.6x crop sensor, a 30mm lens would have an effective focal length of 48mm. That’s the primary reason I chose the Sigma 30mm f/1.4 EX DC HSM lens.
The Sigma 30mm lens stays on my camera most of the time.
When I upgrade to a full frame camera (e.g. Canon EOS 5D Mark II), then I’ll be more likely to ditch the Canon EF 50mm f/1.8 II lens and Sigma 30mm f/1.4 lens, then get the Canon EF 50mm f/1.4 USM.
Why ditch the Sigma 30mm f/1.4 lens? That specific Sigma lens was meant for crop sensors, so there would be slight vignetting.
Of course, I’ve tried both lenses and I love them. I think you’ll be happy with either purchase.
I hope that helps, Chris! If you have any other feedback for him, please leave a comment.
All Narfed Up 
Thanks Bryan, I figured that as much. Since it’s a focal length issue, I’ll go with the 50mm 1.4 since I don’t want to buy another lens when I upgrade to FF body.
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I couldn’t agree more. When I get a secondary camera (cropped sensor), I’ll repurchase the Sigma 30mm.
You won’t be disappointed with either purchase, Chris.
– JT
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Thanks for this review. Although I like both lenses, I’d still choose Canon EF 50mm f/1.4 because I already have a Sigma lens. xD
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