Hi Pere

I don't think it's about the number of pixels at all - more about the "quality" of the pixels. Hopefully I'll get my unit up and running in the next few weeks so I can talk more intelligently from actual experience, but I had a 5 x 7 that I scanned on the 750 (wet mount) and also had drum scanned by Lenny Eiger. The drum scan had a much better range of tonality and shadow detail. I don't expect the IQsmart to be quite as good as Lenny's Aztek Premier, but I do expect a significant improvement over the 750.