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).
Pentax K2000 (K-m) vs. Olympus E-420
Pentax K2000: Pentax FA 50 mm F1.4 lens, Aperture Priority, ISO 100
JPEG Large/Best, Manual WB, Default Parameters (Bright) Self-Timer
Olympus E-420: Olympus 50 mm F2 Macro lens, Aperture Priority, ISO 100
JPEG Large/Fine, Manual WB, Default Parameters (Standard), Self-Timer
3.4 MB JPEG (3872 x 2592)
6.0 MB JPEG (3648 x 2736)
There isn't much to call between the two cameras in terms of detail - the Olympus output is slightly softer but isn't as obviously over-sharpened, either (though there are hints of sharpening appearing on the diagonals of the paperclips). Despite the steeper (higher-contrast), tone curve, the K2000 does a better job of making a smooth transition to clipped highlights on the paperclips.