Digital BW, The Print

What scanner would most professional pre press house people say is the
best in the world at getting the most sharpness and detail out of a 35mm
film?  There was a comparison in Design Graphics Magazine between 20 of
the best scanners in every price bracket. I seem to remember the
Polaroid 4000 DPI scanner came out as the sharpest, even when compared
to a $60,000 scanner. There were samples of 5 different kinds of
subjects, all depicting sharpness and detail in Huge blowups.  Price of
scanner seemed to have nothing to do with the quality of scans.
Are there scanners that can scan at 20,000 DPI Optically or more? Is it
possible to get every last bit of detail including individual grain in
Kodachrome 25 film?
How much would such a scan cost? It would be interesting for someone on
the list who has access to such a high end scanner to make a comparison
between that scanner, and say a 4000 DPI Nikon or Polaroid scanner, and
at what print size a difference could be seen in sharpness.

Jer