I'm a Canon person now working in a Nikon studio. I know Canon L series lenses are the bomb. Can someone please tell me the Nikon equivilent? Or what to look for code wise in Tamron or Sigma? Looking for a good portrait lense and another one for taking great group (reunion-sports teams) shots. I'm very new at this but not always thrilled with the image quality and boss said I could look into better glass. Oh, shooting with a Nikon D2DXs and kit lens. (seems a shame on such a nice camera body) Thanks!