I haven't used this particular lens, but I have used other Fuji lenses and they are very fine. The EP should also be excellent, as a 6 element enlarging lens.
The ES was Fuji's 4-element line, using a Tessar design. The EP line used the standard design for high-quality enlarging lenses, with 6 elements in 4 groups. Neither of these series used Fuji's multicoating, EBC (Electron Beam Coating).
Later brochures that I have no longer mention these enlarging lenses. A later brochure refers to the EX series, which has a similar 6/4 design to the EP, but adds the EBC multicoating.