Depending on how one defines quality, then yes, it has evened out. One could certainly argue that in terms of manufacturing quality, non-Cubans are better at every price point.

For tobacco quality, in the past few years, natural disasters and the 'special period' have played havoc with tobacco crops in Cuba (and their coffee crops as well). Tobacco itself is being used where it shouldn't be. Running (big) leaf veins are showing up in filler, even in excessive-premiums like Behike. (This could also have been a result of the scandal that rocked Habanos, SA, a few years ago - it is great having bar-code seals to guarantee the origin of every (unopened) box, but if what went into the ('grey market') box was substandard, then it doesn't matter.

Comparing the "same" brand names is useless, though. "Same" brands may not be at the same price point - and taste is subjective. Whether the difference is better or worse for one region or another is (now) a matter of taste and personal preference, not quality.

As an aside, cigar-boom era books are often poor resources. The book is perhaps idiotic, as "aging" is not the same as "curing." Essentially there were no aged Cubans produced until about three years ago (the Gran Reserva-labelled cigars). Poorly-cured, a.k.a., "green" tobacco, was found in the latter part of the cigar boom - in Cuban cigars and elsewhere.