"Persons who received the BA.5-containing bivalent booster had better neutralizing activity against all Omicron subvariants (especially against BA.2.75.2, BQ.1.1 and XBB) than those who received 1 or 2 monovalent [original] boosters"
http://nejm.org/doi/full/10.1056/NEJMc2214293
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Note that the dispersion (be aware of vertical logscale) can be seen on the figure, which might somewhat alleviate concerns about very sparse reporting about time-since-last-dose (only extremes are reported, not even average).
I'm also somewhat sad about lack of any demographic information about participants~
