A few things I did not mention; first the EF 16-35mm is weather sealed and that will be very nice to have if you move up to the FF body. Also right now the 16-35mm has a rebate of $100 while the 17-55mm has a rebate of $70 (they end sometime in january I believe). Finally if you are really serious about going into wedding photography you might think twice about the loud AF motor on the Tamron.


Samuel