Erik Jacobson , Aug 11, 2010; 04:38 p.m.
There are really only a few areas where IQ would be effected. #2 and #3 would be your biggest IQ upgrades. If you would use spot meter... then maybe that would help you out.
The Clear, sharper, larger LCD would only help you on live view.
For myself and my uses of a camera, I don't think these things would warrant an upgrade... Now if it was regarding a 50D, 7D or 5DII you would have some jumps that may be more worthy.