(Click the image for a bigger image and here for a massive image)
Note: The small size of this font makes it hard to compare at 11pt, please leave a comment if you think I should up the size for the screenshots.
The images are actually PNG files, although the url says jpg.
Terminus is the closest thing to 6x13 fixed that comes pre-packaged on modern Linux distributions. Remember to turn off aliasing. Bitmap fonts ftw.