No they didn't reveal single core performance. It is commonly assumed that M1 shares high performance Firestorm cores with A14. It looks like Geekbench scores

No they didn't reveal single core performance. It is commonly assumed that M1 shares high performance Firestorm cores with A14. It looks like Geekbench scores for A15 over A14 is about 18% in multithreaded, and 10% in single thread. It is also very likely that the M2 uses the same Avalanche cores as in A15. So I would suspect that this translates to a 10% increase in single threaded performance between M2 and M1 as well. Incidentally, A15 runs at around 3.2 Ghz vs 3 Ghz for A14. So the majority of the speed-up between A14 and A15 comes directly from increasing clock frequency. M1 runs at 3.2 Ghz.