I don't know how Konitizian these Revelation/Hat dates are in terms of actual vocabulary, but nevertheless Ortega & Konitz share the esthetic of avoiding "licks" and such whenever possible, especially on standards, and instead focusing on the melodic elements of improvisation, an approach I myself like to call "lines, not licks", for whatever that is worth.
It's a bold gambit, and almost of necessity requires a "cooler" mien, but when the goals are successfully attained, as they are here, the results are music that is riveting and extremely involving. Especially on standards - you know the forms, and you know how everybody else has done them, and hearing them done like THIS just draws you in, irresistably, because while you're having your superfical expectations thwarted, they're still being met at the primal level - the forms and shapes of the original material remain intact. So, it's tension and release simultaneously. Try getting THAT at Wal-Mart!
Not that the music is as esoteric and intellectually conscious as the above "explanation" of my reaction to it is, it's not. The stuff swings, and with no little heat (maybe a "dry" heat sometimes, but heat is heat, right?).
Bottom line - it's fresh, it's exciting, and it's real. Go for it!