lowkick wrote:
If the goal of a new car is just to get you where you want to go, the Chevy is great. If you want to get there in comfort and style, then you want the Caddy. If the goal of your photography is just to take a picture, then the generic lens is great. If the goal is to take the best, sharpest and most colorful picture you can take, then you want the Canon lens.
If price is the issue, then buy the best you can afford.
Altho most of my lenses are Canon, I wouldn't say that they intrinsically take better pictures than my Tamron or Sigma. However, my lenses are primarily middle line stuff, I have no L lenses.