This is our standard studio scene comparison shot taken from exactly the same tripod position. Lighting: daylight simulation, >98% CRI. Crops are 100%. Ambient temperature was approximately 22°C (~72°F).
Nikon D5000 vs. Olympus E-620
Nikon D5000: Nikkor 50 mm F1.4G lens, Aperture Priority, ISO 200
JPEG Large/Fine, Manual WB, Default Parameters, Self-Timer
Olympus E-620: Olympus 50 mm F2 Macro lens, Aperture Priority, ISO 100
JPEG Large/Fine, Manual WB, Default Parameters (Standard), Self-Timer
4.7 MB JPEG (4288 x 2848)
7.1 MB JPEG (4032 x 3024)
If the sharpening differences between the Nikon and the Canon seemed dramatic, then you might want to sit down before comparing the Nikon's output to the Olympus E-620. Much like the D60, Olympus has gone for a fairly aggressively sharpened, bright color response that will make it easy to get punchy prints from. The Nikon defaults are a much more muted, naturalistic affair. Both can of course be tweaked to resemble the other.