Hi camera experts and aficionadoes

I have got it down to two cameras and am trying to decide which one.

The sony A850 or Canon EOS 5D ???

I am using ths camera only to shoot artwork for reproduction into large 36" x 48" prints. I will use a great tripod (thanks for the previous advice). I need the 24 megapixels to get the resolution I need for big prints

I appreciate any advice on which camera is better for this particular use and why.

I would also appreciate any photo tips for shooting art . I like to use disffused natural light