Compared to...

Studio scene comparison (RAW)

Canon EOS 30D (RAW) vs. Canon EOS 5D (RAW)

Canon EOS 30D
Canon EOS 5D
2,552 KB JPEG (3504 x 2336)
3,509 KB JPEG (4368 x 2912)

In RAW the EOS 5D produces a lot of 'wow factor' and noticeably better per pixel sharpness than the EOS 30D, the difference in detail is even more stark here than in the JPEG comparison.