Just today, I received some disks by Johnny Răducanu, a Rumanian bassist/pianist. This excellent site has a discography.
The Confesiuni [Confessions] disks (three volumes) feature some very fine solo piano playing; the latter two volumes are entirely solo piano as a matter of fact. The same applies to the "To His Friends" album from 1996.
Răducanu is a pupil of Iancsi Körössy as far as I have understood and the influence shows. Still, compared to the utterly breathtaking solo pieces by the master, Răducanu's style is a bit tamer, more romantic maybe. Very nice nonetheless and a name to keep in mind I'd say.
The LP of Confessions Vol 3 in currently up on ebay for a Buy It Now price of 10$, I see.
As for Körössy, I only have a handful of solo pieces by him, but those are really utterly awesome. And those performances bring me to your initial question as I have been asking it myself in a way when I first heard Körössy's solo performance of "All The Things You Are." This piece swings like mad and at the same time it touches heavily on the classical virtuoso kind of thing. Körössy's technique is impeccable, his touch very light and precise, yet the overall effort does somehow still display some earthy blues type of thing with heavy hammering when needed.
IOW, I really don't know; AKA, all of the above.