Please go to the WIX site and look up some automotive Oil Filters. Pick a spin on filter for simplicity. On the list of specs you will see either a nominal micron rating or a beta rating that determine the level of filtration on that individual filter.
Wix is one of the few sites that has specs.

Go to their section on air filers and look up CA7421 (the regular disposable filter for my Van) in the competitors search. This will bring you to the Wix version for my van and look up on the list the filtration level in microns.

What I found when I looked 8 years ago was that there is no specs on the level of filtration of Wix automotive air filters. They do give a flow in cfm.

My brief look on the Fram site also did not show any level of filtration specs for even their disposable air filters.

With out any specs to compare how can someone say the washables don't filter as well as the disposables?

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84 300D, 82 Volvo 244Gl Diesel