Add comparison to other plugins

README.md

@@ -3,11 +3,15 @@
 ![](https://travis-ci.org/ertrzyiks/hexo-filter-responsive-images.svg?branch=master)
 
 Generate mutliple versions of images for responsive Hexo 3.x blogs
-
-Similar to [hexo-img-optimization](https://github.com/vkuznecovas/hexo-img-optimization), but is
-integrated with `hexo generate` and works also with `hexo server`.
-
-It depends on [sharp](https://github.com/lovell/sharp), so doesn't require ImageMagick to be installed.
+It users [sharp](https://github.com/lovell/sharp) library to transform images.
+
+Comparison to similar plugins:
+ - [hexo-img-optimization](https://github.com/vkuznecovas/hexo-img-optimization) adds a separate command and doesn't work
+    with `hexo server`. Requires ImageMagick to be installed. This plugin is integrated with `hexo generate` and works with `hexo server`.
+ - [hexo-image-sizes](https://github.com/ottobonn/hexo-image-sizes) is very similar, but is not integrated with the routing, so it can't be used
+   with other plugins like https://github.com/hexojs/hexo-asset-pipeline . `hexo-filter-responsive-images` plays nicely with other
+   routing based plugins and is optimized for performance for local testing by being lazy - nothing is transformed unless
+   requested.
 
 ## Installation