Fujifilm is officially offering this excellent film only on their Japanese home market.
Fujicolor Superia Premium 400 is different to Fujicolor Superia X-Tra 400 primarily in its color rendition: It has a different spectral sensitivity resulting in a visibly different color rendition.
Fujicolor Superia Premium 400 has a very fine and homogenous grain, exceptional sharpness and resolution.
Concerning the parameters sharpness, resolution and fineness of grain Superia Premium 400 surpasses Kodak Ultramax 400. It also surpasses Portra 400 concerning sharpness and resolution.
Wide exposure latitude.