Image quality results have been added to the Tamron 45mm f/1.8 Di VC USD Lens page.
I think that you are going to like what you see from this lens. There are many lenses that could be compared with this one, but I'll start things off with the Tamron 45mm f/1.8 vs. Canon 50mm f/1.4 with both lenses set to f/1.8.
The Tamron 45mm f/1.8 vs. Sigma 50mm f/1.4 Art Lens comparison is another interesting one (f/1.8 vs. f/1.6 in this one).
B&H has the Tamron 45mm f/1.8 Di VC USD Lens in stock.