The Nikon photos will be under sharpened because it's so easy to apply sharpening in post, and the amount of sharpening is very dependent on the size and format

The Nikon photos will be under sharpened because it's so easy to apply sharpening in post, and the amount of sharpening is very dependent on the size and format of your desired output. Also, in ideal conditions (medium sized, evenly and brightly lit, static subject a moderate distance away) practically all cameras will give good results: try comparing in less ideal circumstances like a darkish area indoors.