Preheat the oven to 450°F and put a large oven-safe skillet on the middle rack while the oven heats. Cut the fillets into serving-size pieces. Using a brush, rub a small amount of soy sauce over both sides of fish. Set aside in the refrigerator. Lay out 3 shallow bowls for flour (or any seasoned seafood breading), egg and panko. Season the panko with a big pinch of salt. One at a time, dredge the fish pieces in flour, shaking off the excess. Dip them in the egg, and coat with the panko crumbs. Pull the pan from the oven and coat the bottom with 2 tablespoon of oil. Arrange the fish pieces in a single layer. Bake until just cooked through, flipping halfway through.