Light source is different between the v1 and v2. v1 has cold-cathode flourescent light and v2 has white LED illumination. Additionally, v1 has a built-in optical device (grain dissolver) that can be placed between light source and film. This reduces the exaggerated appearance of grain in the scan that is common with scanners (especially those with led illumination) and is also less prone to show scratches in film (no ICE in BW). Perceived sharpness with grain dissolver is a bit less than without it, but detail is still there. And since Minolta 5400 really has some resolution to spare, you get all that sharpness back when you resize to your desired resolution (35MP is overkill for 35mm, imho).