We'll just never get an exact answer, or only decades down the line. We also don't know how quiet the US subs are, it's all just guesswork based on the clues of how far along a country's industries are + how new the designs are.
A more accurate estimation is to say there are overlapping confidence intervals for Virginia/688i/093B/Akula/Yasen and it's very much up to imagination/speculation in which direction the confidence intervals overlap.
I'd hope it would be more informed speculation and estimates rather than imagination.
In general, it's just better to coach the language in uncertainty whenever talking about PLAN nuclear submarine quietening.