Just an airplane. It just flies.
The impressive appearance of the Su-57 is not just a design, but a consequence of the unique architecture of the fighter. The airframe of the aircraft is made on an integrated circuit, which, along with the thrust vectoring engines, give the aircraft impressive maneuverability. Also, the Sukhoi fighter was created with a wide use of low-signature technologies - the glider has characteristic contours that reduce the effective dispersion area and give the aircraft a predatory features.