Are there any good players who have uploaded some of their hand-histories somewhere? I am looking for at least a few thousand unfiltered hands including hole-cards. I need this to learn how the best play.
There are many better ways to learn than that. You're unlikely to find hand histories from professional, or highly skilled amateurs, easily available online. Releasing said hand histories would be suicide. The closest your going to get, and easily one of the most productive ways to improve your online poker game, is to watch videos of skilled players playing. They will either explain what they're doing in real time or review their play afterwards. Reading poker books, online poker forums, watching videos, and so on, is definitely more productive than going through hand histories of high stakes pro's. You would have no idea why they're doing what they're doing.
There are generally two types of players a poker regular has to concern himself with. Fish and other regulars. When playing fish all said player has to do is identify the fish's strategy and implement the maximally exploitative response. However, against another regular, said player also has to be concerned about balancing their own strategy as well. Reviewing hand histories between two regulars without knowing any poker theory, or the history between both players, will only teach you extremely bad habits.
Below are some training sites that release high quality instructional videos from professionals. And yes, you have to pay for them.
There are many sites that sell hand histories:
If you're just looking for the way "good" players play, then you should be able to deduce that for yourself. For example, import the purchased hand histories into Holdem Manager or Poker Tracker or whatever you prefer. Filter the data for the kind of players you're looking for (e.g., look for players with large samples and good win rates in the games you want to play in). Then just review those hands.
It's pretty straightforward if you want to do this. Just search Google.