Maybe a better comparison is from some of the microframeworks for PHP. As you can see, Sinatra influenced a lot of frameworks in many languages.

From Slim: (http://www.slimframework.com/)

require 'Slim/Slim.php';

$app = new Slim();

$app->get('/hello/:name', function ($name) { echo "Hello, $name!"; });

$app->run();

From Silex: (http://silex.sensiolabs.org/)

require_once __DIR__.'/silex.phar';

$app = new Silex\Application();

$app->get('/hello/{name}', function($name) use($app) { return 'Hello '.$app->escape($name); });

$app->run();