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But which other coronaviruses are widely circulating right now is the question. As in, if you were to lose your smell because of a coronavirus, how likely is it that it was not SARS-CoV-2?

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I don't know the absolute figures in terms of cases per year, but the four common coronaviruses are... common. From [1], we see that 1 in 200 flu-like infections was the coronavirus HKU1. This [2] paper corroborates and gives figures for the other three common viruses.

We can therefore assume that about 1 in 25 bad-cold or flu-like illnesses are caused by a coronavirus.

1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5466428/

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