Allegedly, someone named Willi told that still it was not the end of Germany, but Hitler said that it was all over now.
Hello Masutin, welcome to the forums firstly! I am unaware of Hitler having said anything along the lines of Germany is finished after the Tirpitz, a ship that had largely been inactive for years. He might have said the Kriegsmarine was finished, but I truthfully am unaware of him saying anything.
None that I am aware of, and it is certainly not "famous", or else it would be readily available. AFAIK various sources have Hitler being aware that the war was lost at various times between 1943-44(no, the Tirpitz sinking is not one of those times), while more have him holding out for a negotiated peace. The loss of the Tirpitz would not have effected any of this one iota.