Ralph Jensen , May 12, 2008; 05:13 a.m.
Well, if pixel size was all that mattered, a 1-megapixel full-frame camera would have better picture quality than the 12-megapixel 5D, but there is of course no 1-mp SLR, for a reason:
The "huge pixels" are only "ONE OF" the reasons the Canon 5D has such great picture quality, as you say.
There are many other factors involved in Image Quality besides pixel size, and trying to judge IQ based solely on specs - or on brand name, or on anything other than actual images - will be a dead end.
Fortunately, plenty of direct comparisons of images taken by different cameras are available online. See this page, for example -
... and you can compare images between any two popular SLRs here: