
I have just bought some more Glass for my EOS1D Classic, an EF24-85 f3.5-4.5 USM. There's a Thread dedicated to this Lens which has some good Photo's on it, though it's no "L" so it's best not to get too carried away!
The 24-85 will work well with the 1.3x crop wide open, you'll be pleased.
Jason C