I’ve had time to compare DXO 4.5.1, 5.0.2 and Photoshop CS3. I’m using this image, click it to download the raw NEF:
First, here’s the center crop. Mouse on = DXO5.0.2, off = DXO4.5.1

Mouse on = DXO5.0.2, off = PS CS3

DXO4 vs. DXO5 left crop:

PS vs. DXO5 left crop:

DXO4 vs. DXO5 bottom-left crop:

PS vs. DXO5 bottom-left crop:

