If you use a good macro lens and lighting setup, you can get good results with a 1Ds. The main advantage to a scanner is that you can scan at a higher resolution than the 1Ds offers in true RGB color (no Bayer color interpolation), process with Neat Image to reduce noise/grain, then downsize to 1Ds resolution and have a slightly cleaner file than you'd get from the 1Ds. A 3600DPI film scanner will get you a 35mm scan of about 5400x3600 pixels, but many of those pixels will be devoted to detailing the film grain structure rather than actual image data. Either way you're still limited by the film.