I have the FA 100mm and I love its IQ, but sometimes I miss shots simply because it is too long, so my vote goes to the tamron!
Although like what OGL said, I really think you should also consider the Sigma 70mm, which I have seen to have extremely good IQ and it is even wider.
For macro work, I suggest you go with the FA 100mm macro. The color, contrast, and sharpness are one of the best and it makes simply amazing photos. The only problem with it is it's slightly hard to hand-hold while doing macro work (portraits should be fine though).
Last edited by GLXLR; 06-17-2009 at 09:14 AM.
Reason: Adding stuff