My livefocus is a little different on the 20Da so I can't check, but I'd say it's just normal for the new models to show this behaviour.
As long as you're happy with the images on the computer.
It's recommended that a little sharpening be applied to all images, especially with RAW files.
Canon cameras do have a slightly softer image generally due to the algorithms that Canon uses I believe.
As you probably know you can also set sharpness levels in the Custom Functions too, but I always check it in Photoshop later.