This looks reasonable straight out of the camera. It is equally sharp in all four corners, and the contrast is as expected for a cloudy day. The trees show some of the strong compression the Mavic is known for, but it's not too bad here.
If you post-process your still images, you can enhance the sharpness (sharpness filter, or unsharp mask filter) and tweak the overall contrast or color levels.
If you shoot DNG images as well, you will see that they have much sharper detail at the expense of a little noise and a warm zone in the center of the image.