No.
300D, 350D and 400D are all in the same class.
300D, 350D, 400D should be on equivalent level with the D70, D70s and D80 if I'm not mistaken.
The 10D, 20D and 30D are on almost the same level as the D100 and D200, but the D200 is better than all of the three Canon equivalents in some respect.
how to compare when cannon run on cmos sensor while nikon run on ccd?