CKEditor is crippled in Xpages. In 8.5.3, you can't resize images or align them. IBM crippled CKEditor for some reason, could be some business case where editing a web page in the Lotus client could break things to much. The strange thing is that the XWork server has no Notes clients and if you have a web page made in CKEditor why would you edit that in the Notes client?
This integration of TinyMCE is very good news. We have used TineMCE ( made in SWEDEN) and it's very good, it's as god as a non crippled CKEditor.