One could even define intelligence as the efficiency with which one converts experience into competence; by this definition they lag very far behind us

Yes, one could define intelligence in this way, and one would be right. By this metric current AI is approximately 6 OOMs less intelligent than humans.

Your ancestors' evolutionary history did not prepare you for Python programming, yet you can learn to competently program in Python in a few hundreds of hours. An LRM needs the training data equivalent of ~1B hours (on top of all of its non-programming related training data).

Another dimension where which current AI is far below human level is test-time compute efficiency and energy efficiency. A human can solve an ARC-AGI-3 game by burning an amount of energy that would cost under $0.1 at retail electricity prices. Astra costs about $300-$400 per game. That's a 3-4 OOM gap.