Thanks for the info!!
My embedding code differ in the padding values of the div:
<div style="position: relative; padding-top: 56.25%;">
The CMS generates the following:
<div style="position: relative; padding-top: 55.1724137931%;">
In my case this results the Vimeo video to be not 100% of the width as the other content.
Maybe someone wants to test this on their site to double check that.