To follow up on what ATA L1011 said, the main cargo disadvantage of the 767 versus the A330, or DC10 and MD11 for that matter, is that it can only take one row of LD3's, whereas the others can take two rows.
I don't know about the 757. I do know that the A320 series can take a container (big deciding factor for SAA and ANZ for example), but I don't know what the name is, whether it is an LD3 or something smaller. So I assume that the 757 can take some kind of container, but maybe not the LD3.
Okay, enough talking out the rear. Any insight, anyone?!
It is not enough to be rude; one must also be incorrect.