This review shows me a lot of clear and positive information about this lens.
I have this lens for a few weeks mounted on my Nikon D7000. I also had the Nikon 35mm 1.8g lens. The Sigma lens is way better build and the built-in autofocus motor is much quieter. As I experience it so far, the image quality/sharpness is a little better on the Sigma. Anyway, thanks again for this review, it is just like you describe, Sigma 30mm F1.4 DC HSM A: good all-round performer