No ?
Is that what he meant, pixel size not sensor size ?, not how I read it but
you maybe right.

The D2X will have higher resolution (its covers a smaller area of the image)
BUT theoretically will have a worse noise figure due to smaller pixels.
read the bottom of this page http://www.dpreview.com/articles/canoneos5d/

It's obviously lower but noise is better.

I would think a larger pixel size would reduce resolution,

Resolution is noticable, all other things equal, until you reach the limit
of the eye.

Cheers

[]

In the final image, viewed at a constant size, the number of pixels
affects the apparent quality of the image as perceived by the viewer.  So
the same scene taken with a 6MP sensor would not look as sharp as with a
12MP sensor, but you may need to hold the print quite close to see this
(depending on the print size).

As the 5D has larger pixels, when using the same lens each pixel will have
a larger angular subtense and so cover a greater area of the scene.  Each
pixel subtense is a lower spatial frequency, and therefore be working in a
region of the MTF curve for the lens nearer to the left side, perhaps
where the MTF is higher.  Therefore, the 5D's pixels should be less
reliant on lenses with an extended MTF, so the lens should be less of a
limiting factor in terms of image resolution.

Of course, the trade-off for the lower resolution is the wider angular
field of view of the image with a given lens.  There is another effect as
well independant of lens.  Rays of light near the edge of the sensor
arrive at a greater angle of incidence than those at the centre.  In a
full-frame sensor the angle of arrival is greater than in a smaller sensor
(for the same lens), and this makes it more difficult for the sensor to
respond correctly.  It remains to be seen how well Canon have dealt with
this problem.

David

It will give you less resolution at the surface of the sensor, yes.
But it is very few of us that view our photographs by examining
the photon wells at the surface of the sensor.

The normal way to view a photograph is to make a print on
(20 x 30 cm say) paper, and then look at this print.

If your favoured way of looking at photpgraphs is viewing prints,
(rather than sensors), you'll discover that the pixel has no size,
and the most important characteristic to determine maximum resolution
is the /pixel count/.

(The size of physical sensor cells still matters, because they
decide such factors as noise, dynamic range, etc. - but for all
those factors, bigger is generally better.)

This particular aspect of digital photography seems to confuse
some people, so I've but up a webpage where I try to answer
the most frequently asked questions about pixels, please see:
  http://folk.uio.no/gisle/photo/pixels.html

No, the 5D pixels are about 20% bigger based on my calculations.

Larger pixels = more sensitivity to light and less noise.

Larger pixels reduces resolution because you can fit less pixels on the
sensor, but larger pixels perform better and result in higher image quality.

None you improve resolution

Correct, but you will find that resolution isn't everything, noise can be
more important.