Maria Kliegel is one of the most generous persons that I've meet in my life. She wants to share her knowledge with everyone and in the master classes she always treats all students equally.
At this moment we can say she is the best cellist of the world, but, of course, without saying other cellists are incorrect.
This is one of the things that MK has clear, and she's very open to all versions. In fact, when you receive her classes, she doesn't want you to make her own version with her fingerings and bowings and musical details. She is very open and helps you to improve your version.