I'll chime in to defend the OP's choice for the Tamron. My business is people photography, but when I started taking photos I was just trying to build a well rounded lens collection, so I scored anything that was a great deal. After a few years I had picked up some killer wide angle lenses (16-35mm F2.8L ii, sigma 24mm F1.4) and one decent portrait lens (24-70 F2.8L ii). After joining this forum, learning, and then readjusting my priorities, I sold all of my great wide angle lenses and put the money (plus a little bit more) into a few nicer portrait lenses (85mm F1.2, 70-200 F2.8, 100mm F2.8L, and 135mm F2L). Today the widest lens I own is a Tamron 35mm F1.8 because it has stabilization and is a general all around fun lens to use for pretty good results doing the things I sometimes do for fun. I've borrowed much nicer 35mm lenses, but I can't justify buying a nicer "fun" lens. The OP said he doesn't shoot people and is dabbling, it sounds like a "fun lens" to me, and I think the Tamron 85mm was made exactly for him. With the stabilization he'll be able to get a lot more random various uses out of it than if he had gotten a weapon of mass potraitude. If he ends up loving portraiture and wants a more serious lens, he won't be out TOO much to sell the tamron and move up. I think it was a pretty smart buy, given the circumstances.
Although a purchase was already made, I would have a lot of fun sharing my 2 cents about choosing a lens for people photos. We rarely have the luxury of a massive desert with endless space for a scene (like the link I saw earlier), so for me I choose a lens based on how much background I want to see. 85mm if I want the viewer to know where the photo is taken, 135mm if I only want them to see small clues... 70-200 if I don't know what the shoot will throw at me and I need to be ready for anything. But the 85 at a distance, wide open, creates pure magic that I haven't seen in another set of specs. Also the 135 F2L really is a damn miracle, although not the sharpest thing on the planet, it was the lens that made me realize that sharpness is a ways down my list of priorities.