Its an interesting exercise, but ultimately it just dissolves into pixel peeping. The real test is what the final print looks like - something that the guy at photo-i makes a point of. There are so many other factors that can affect the final image - film, exposure, focus, lens used, development - that scanner performance makes a much smaller relative difference.
I use the Epson 4990 and I'm happy with the results I get using Silverfast both from 120 and 35mm - B&W, C41 and E6. The best results by far are from B&W and E6 (at least to my eyes). This doesn't mean that I couldn't improve upon the results by using a high end scanner, but would they be noticeable to a print viewer (who BTW probably wouldn't have a loupe or densiometer to hand 🙂 )
george,
IMHO, you haven't lost much switching to the V700 from the Multi Pro, but you've gained some $$ 🙂