I would say that Marcelo is much better, but how much is difficult to quantify. Marcelo has done it for a number of seasons, Robertson has really only done it on this stage for 3/4ths of one. I don't think this comparison is that close, but I do think Robertson is easily in the discussion for better players at what's a pretty weak position. Because he plays for Scotland and Hull before now, he may not have gotten press he should, but he offers a lot at the position at a fraction of what Marcelo costs in wages. Money doesn't mean anything for Real, but for Liverpool, getting him for what they got him for, and paying him peanuts is a big deal.
I don't know that there's a ton of difference in Ramos and VVD, but I do know that Ramos is better. The question is once again how much. I think of VVD stays fit, plays like he has since Winter on for Liverpool, and he'll be in the discussion. Right now, I would take Ramos, but next season? It's hard to see where things will be. I've never been a Ramos fan, but it's hard to argue with the fact that he's one of the best to play his position. With the things he's won, if VVD ends up winning even a percent of what he has, it would be amazing. that said, one of the things that led to the high fee, is Virgil has physical abilities that are hard to match. The dude is massive. He's one of the faster players on the pitch for his size. Ramos is physically gifted, but he's just not that tall.