Compared to...

Studio scene comparison (higher sensitivities)

The E-410's default Noise Filter setting keeps visible noise to an absolute minimum at the expense of image detail which is frankly heavily blurred. As you can see from the crops below if you're not uncomfortable with a little visible noise you can turn the Noise Filter setting off (and turn down sharpness) to get the more detail.

ISO 800

Olympus E-410	Olympus E-410 (Noise Filter Off, Shp -2)
Nikon D40X	Canon EOS 400D

ISO 1600

Olympus E-410	Olympus E-410 (Noise Filter Off, Shp -2)
Nikon D40X	Canon EOS 400D