I went ahead and ordered this lens from cameta, and it should arrive later this week.
I had been putting it off because I really don't want to expand my lens collection any more than I have to, and I've been getting great portraits with my 105mm micro Nikkor... plus I've been very broke.
However, that all changed about a month ago when I shot a wedding in Portland. For about 90% of the wedding I shot through a borrowed Nikkor 85 1.4 AIS and was just blown away with the light gathering abilities and the look of the images I got from it. Manual focus was such a blissfully rewarding experience that I consigned myself to shoot one more wedding with the 105 micro and then plunge for this Rokinon, which is what I did. I'll post back when it arrives.