Vuk Stanković

English:
This plugin (widget) shows only comments posted on pages or wiki pages. It can also be used to display comments posted on posts (like regular recent comment widget). 
User can edit title of a widget and select number of comments to show, and select type of page to show comments from.
<a href="http://vukstankovic.com/en/2012/04/page-comments/" rel="nofollow ugc">Plugin page</a>
Српски:
Овај додатак приказује најновије коментаре постављене на вашим страницама или вики страницама уколико имате инсталиран додатак. 
Корисник може да измени наслов виџета и да изабере број коментара који ће бити приказани, као и да одабере тип страница са којих ће коментари бити приказивани
<a href="http://vukstankovic.com/2012/04/11/page-comments/" rel="nofollow ugc">Страница додатка</a>

Page Comments

This plugin (widget) shows only comments posted on pages or wiki pages (if available).

Seth Alling

Up until recently, WordPress gave two options: You could either disable comments and trackbacks by default for all pages and posts, or you could have them active by default. In WordPress version 4.3, this finally changed so comments are always disabled on new pages.
While the new change makes it easier for many of the sites, it make it harder for people who need to get the reverse and enable comments on all pages, or if they need to change the default for a custom post type. This plugin allows you to choose whether comments are enabled or disabled by default on all new posts, pages and custom post types, while still giving the ability to individually enable comments on posts or pages.
Also, this plugin provides a way to quickly disable all comments or pingbacks for a specific custom post type. It directly interacts with your database to modify the status, so it is highly recommended that you backup your database first. There shouldn’t be any issues using this feature, but it’s always good to play it safe.
<a href="https://github.com/sethta/no-page-comment" title="No Page Comment Development on Github" rel="nofollow ugc">View No Page Comment Development on Github</a>
<a href="https://github.com/sethta/no-page-comment/issues" title="Report an Issue about No Page Comment on Github" rel="nofollow ugc">Please Report any Issues about No Page Comment on Github</a>
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5WWP2EDSCAJR4" title="Donate to support the No Page Comment Plugin development" rel="nofollow ugc">Donate to Support No Page Comment Development</a>

No Page Comment

An admin interface to control the default comment and trackback settings on new posts, pages and custom post types.

Page Comments vs No Page Comment