WP_Comment_Query

$args = array(
	'author_email' => '',
	'ID'           => '',
	'karma'        => '',
	'number'       => '',
	'offset'       => '',
	'orderby'      => '',
	'order'        => 'DESC',
	'parent'       => '',
	'post_ID'      => '',
//	'post_id'      => 0,
	'post_author'  => '',
	'post_name'    => '',
	'post_parent'  => '',
	'post_status'  => '',
	'post_type'    => '',
	'status'       => '',
	'type'         => '',
	'user_id'      => '',
	'search'       => '',
	'count'        => false,
	'meta_key'     => '',
	'meta_value'   => '',
	'meta_query'   => ''
);

$comments_query = new WP_Comment_Query;
$comments = $comments_query->query( $args );

// Comment Loop
if ( $comments ) {
	foreach ( $comments as $comment ) {
		echo $comment->comment_content;
	}
} else {
	// no comments

}