Judging colour is a difficult task at the best of times. However, the overall tone of the print and negative scans produced by the HP 5530 (below) look respectively less natural and more washed out when compared to those produced by the Epson unit.
This montage shows the level of definition you can expect from this scanner when it is used to scan from colour negatives. The top picture is a scan of a professional print made from the same negative. In the picture below that, much of the fine detail is lost.
This is a positive scan from a transparency/slide. Granted, this is a small version of the full scan, but it does give you an indication of the detail captured and the colour accuracy. The insert shows the quality of the scan at 100% resolution (ie. 2,400dpi). You can notice some overall fuzziness, and some blue coloured fringing along the edges of the wing mirror.
The picture below is a direct comparison between a 2,400dpi scan of a transparency produced by this scanner (top) and the Epson Perfection 3170 Photo (bottom). Notice the difference in colour.