See, you're comparing a group stage match against a playoff match, which changes some of the context. Liquid were playing terribly in their group matches the past few months, it wasn't until Cologne that they began looking composed.
I definitely do not believe HR are better than Mouz strictly on the basis of matches against Liquid (especially since that Liquid and the current Liquid are different, because they were struggling in groups at the time), nor do I believe, strictly, that G2 are a better team than Vitality overall. I believe they have better team play with each other and rely less on preparing for the teams they're facing. They are also more consistent from top to bottom. Does this mean they are beating higher caliber teams? No, but a team like ENCE, who Vitality are great against, are prone to anti-strats. Same with Astrlis, since their current lineup seems to have lost some of their edge.
But on the same token G2 have looked pretty good against most teams lately, and Vitality have lost to some teams they shouldn't.