The recently announced Olympus E5 disappointed many by not introducing any innovations, but it seems that in the area of image quality, outstanding improvements have been made.
The Dutch Pixelmania site has this to say:
"Especially when using high quality lenses the Zuiko Top Pro series delivers the E-5 photos that sharpness can compete with full-frame reflexes."
See:
Olympus E-5 - Tests - Pixelmania.nl
I don't think I'll be getting one until the price come down, though!
Jim