Not exactly, but not far off.
http://forums.tweakguides.com/showthrea ... 62&page=36
Scroll to third from bottom post, #358.
Screenshot comparisons of Very high in DX10/Vista (left) against very high in DX9/XP.
Shock horror, they look virtually identical.
Only difference I could make out was the relections on the water in the first comparison.
Oh, and the massive difference in frame rate!!!
Possibly done better. Again, no real noticable differences.