Ok, well I'm coming up on a chance to buy a Canon 28-70mm 2.8L, but I already have a Tamron 28-75mm 2.8. Now I know the Canon is an L but it's an old lens so I'm wondering if it's worth it, even though I already have the Tammy 28-75mm. I currently shoot with a 50D but I've got a 5DII on the back of a UPS truck (should be here by Thursday).
What are you thoughts?

