I don't agree totally with what Sriram has said. The EOS 3 and 30 are catered for different users. For more precise control and robust handling, pros and advanced amateurs will generally prefer the 3. There are quite a number of (pro) features found in the 3 which are not found in the 30. It's really up to your shooting style. You don't want to get a 3 if you don't use its features. Similarly, you might not want even a 30 if a 300 suits you fine.
For me, 30 lacks several important features which the 3 provides. As for eye-focus being more "accurate" in 30, that's quite true. But then again, the 30 has only 7 focusing points while the 3 has 45!! I don't bother much with eye-focus cos I concentrate on only 1 focusing point at a time. Again, this is my shooting style.
It is not true that the 35mm f/2 with the 50/50E is as hopeless as Sriram says. I own both combi and they work fine. If anything, I felt the 30 is a worse perfomer in low light without the Speedlight attached as it doesn't have any AF-assist light on its body.
I can go on and on about the advantages of the 3 over 30 but it isn't fair as I probably shoot differently compared to Sriram. For one, the 3 has a much more solid body than the 30 (feels more "plastic" in my hands). If you use long or bigger and heavier L lenses, you'll appreciate this point.
Well, at the end of the day, it all depends on how and what you shoot. You don't want to get a sports car if a family sedan will do just nicely.
