Of course, nothing is wrong with the scenery, otherwise the problem would have been present on the old PC as well.
When installing the new PC, you probably forgot to set your FS9 config or your video card config like it was before. Things that affects texture sharpness are:
- The Global Texture size slider in FS9, it should be set at "Massive"
- The video card settings for anisotropic filtering: it should be set at 4x minimum, but 8x or 16x it's better.