I should probably already know the amnswer to this, but just wanted to confirm. I shoot with a Canon 5D Mark II and sometimes miss the extra length I got with my Canon 30D and 1.6 crop factor. I have been looking at the new Tamron 70-300 with VC. As I get more professional jobs I sometimes feel a little funny not having all L-series lenses like most pros. I only have two the 17-40 F4L and 85 1.2L. However, the lens I absolutely use the most is the Tamron 28-75 F2.8. I have not been able to bring myself to buy the 24-70 F2.8 because I absoultely do not see a $1100 improvement in IQ. With that being said I should upgrade my Sigma 70-200 to the new Canon 70-200 F2.8 IS II but that is insanly expensive. I am sure I am going to be a photographer for a while but I don't feel I need L-series lenses to do pro work and the $399 price tag of the Tamron really appeals to me. Would this be a waste of money if I inttent to pursure professional work?