Okay - so, got a XTI with kit lens and a 70-300 Sigma APO. Now am looking into the prime lenses and am looking at the two (affordable for me) Canon 50mm's. My choices are: the 1.8 at $135 after taxes, or the 1.4 at a much larger $450 after taxes I fully expect to stay with Canon for a number of years and am planning a switch to a higher end body in a about two years, so whichever lens I choose can be seen as an investment. BUT - is the difference in quality, focus (I hear the 1.8 searches a ton...), and general output worth this much dough? Please let me know what you think, especially if you've shot both. PS - I bought the 1.8 last night and will try it out after work tonight. The 1.4 is on order and can upgrade.