The following image shows a composition of all the current potential habitable exoplanets candidates in the Habitable Exoplanets Catalog. The exoplanets are ranked by similarity to Earth from best to worst.
The only two confirmed exoplanets in the data, HD 85512 b and Gliese 581 d, still rank very low as compared to the NASA Kepler candidates. All planets are shown to scale with Earth, Venus, Mars, and Mercury included for comparison. The image will be updated with any new results from now on.