Dirk Loechel has finished his ultimate update to his gigantic starship comparison chart (that's a gigantic chart of gigantic starships). He's not the only person to produce these charts, but his are the best and most exhaustive. This is massive, so click on the image to be taken to DeviantArt where you can see a larger image and download the full-sized one. As Dirk states in his FEQ, things like the Death Star, V'Ger and other super-enormous structures are just too large for this chart, without losing everything else due to resolution limits. The TARDIS is on there, but it is both far too small to see at this scale, and infinitely large so impossible to resolve on the screen.