I just got a Tamron 28-75 2.8. I'm not LOVING it. Its extremly slow to focus, which is my main pet peeve. Don't get me wrong, it's a fine lens, but I'm kind of regretting getting it instead of the 50mm 1.4. My 50mm 1.8 has treated me very well, but it's currently out of commission (don't really care to replace it). I shoot with an XTi, so I can't take advantage of the full frame with the Tamron. It's versitile- its only saving grace at this point. I have a couple of weddings coming up and would prefer not to rent a lens. However, the majority of my work is portraits where the 50mm 1.4 would be perfect. Budget is tight right now, so if I want the 50mm 1.4, I would really need to sell the Tamrom. What would you do?