Hey guys, I recently returned a Nikkor 85mm 1.8 lens that I bought new for $480. I found the low light to be worse than my 35mm 1.8 and overall the quality and sharpness was disappointing. Not to mention it had some trouble focusing. I use a D7000. I don't have a a huge budget, but I'm getting into commercial photography and need a good portrait lens. The Sigma seems to have good reviews (but so did the nikkor), and from my 5 minute trial at my local shop i found it to have a nice bokeh and seemed a bit sharper than the nikkor (even wide open). This lens is twice the price of the Nikkor at almost $1k. What are your thoughts on the upgrade? Is it worthwhile or bust? Any input is appreciated. The popular nikkor 85 1.4 isn't really a consideration, at about $1,350 its definitely a bit over my budget for such lens. Thanks!