How to theme /comment/# page
There's no conventional way of doing this as far as I'm aware but if you want to do this it can probably be achieved with some processing in your theme.

function THEME_preprocess_page(&amp;$variables) {

  // DO SOMETHING WITH request_uri() or similar

  if (isset($SOME_VARIABLE)) {
     $variables['theme_hook_suggestions'][] = "page__comments";
  }
}


Then create a copy of your page template as page--comments.tpl.php and take out what you dont need.

This is nasty though and not the 'Drupal' way of doing things.