Are there any videos of women comparing boob size
There are many scenes in movies that have this basic topic.Most times they are throw-away lines or just intended to show the character, vanity, or competitive nature of one of the females without using overtly masculine themes.
Movies such as;
Down and Out in Beverly Hills
Grease
Meatballs
Evil Toons
and even more subtly in movies such as;
Breakfast Club
Rocky Horror Picture Show
If you are looking for just a video of women comparing the size of their respective chests... well, there may be some custom vids out there and I am sure there have been some scenes tossed into some adult movies I suspect to "talk up" the female lead as being "so impressive".
Although women do compare in real life, they tend not to do it to the extent that it appears you are asking about.
In a recent thread there was this scene discussed:
http://forum.bearchive.com/index.php?topic=9992853.msg10360995#msg10360995