Well, for what it's worth, here's what Bergman felt about Tarkovsky:

"When I discovered the first films of Tarkovsky, it was a miracle. I suddenly found myself before a door to which I had never had the key…a room which I had always wished to penetrate and wherein he felt perfectly at ease. Someone was able to express what I had always wished to say without knowing how. For me Tarkovsky is the greatest filmmaker"
- Ingmar Bergman 