For information, I have made a short comparison between two inexpensive flatbed scanners for 4x5", the 'old' Epson Perfection 1200 Photo and the new Canoscan D2400UF, and one film scanner, the Polaroid Sprintscan 45.
The results are presented on the following web page: http://elbereth.obspm.fr/~kervella/Scanners/index.htm
As I have been helped a lot by the contributions of the members of this forum for my first steps in large format, I believe it is natural that I bring also my two cents :-). As a general summary, I find this scanner a very good piece of equipment, especially considering its price.
Of course, I would apreciate any comment you may have on these results.