The 7OC Blue by a mile on the sharpness. Also much much smoother than the Rubies.
The Rubies are a Russian local market blade. They are similar to an Indian Wilk in my opinion - sharp enough but not at all smooth. I usually feel a little roughness to be honest. A very serviceable shave but not one that makes you go "wow, that was a great shave!"
The 7OC Blue that I have are the Czech version and are very sharp blades. I put them between the 7OC Black and the Silver Blues. If you are looking for the ultimate sharpness then the Silver Blues are what you want if Feathers do not suit you or are too sharp.
When Gillette closed that factory and moved the production to PPI St Petersburg, they manufactured the 7OC Blue there for at least a while. The manufacturing addresses are clearly marked, so you will know which version you have fairly quickly.