"Comparing" is a tad harch, its more like an apples to oranges and Klingons to Jedi thing:
 
"This article compares all the affordable weather-sealed DSLR cameras in production. These DSLRs are the Canon EOS 7D, the Nikon D300S, the Olympus E-3, the Pentax K-7, the Pentax K20D and the Pentax K200D. The definition of weather-sealed varies between models but does not mean waterproof, so all DSLRs

The Google translation says "most historical", and we can't quite make out some of the orther stuff, but the camera models selected speak for themselves. One interesting tidbit is the medium format film camera among the 10, and also the complete lack of any Canon models. As an added bonus they list the most historical cameras of the past 10 years too:

Destined to be labelled as a "milestone camera" by future camerologists, the K10D is more revolutionary than every digital rebel has ever been. Also, its giving the marketing departements at Canon, Nikon, AND Sony a run for their money,  and it makes  prospective buyers of DSLRs drool over it's impressive feature list: 10 Mp, in-body shake reduction, dust removal, and weather sealing. The last of these features is usually only found in +$4000 camera bodies.