Remember there are some major differences between aluminum prints and prints made on metallic finish paper.

First, aluminum is more reflective than paper, which is one of the reasons prints made on it "pop" more. Second, aluminum is flatter, which also enhances reflection.

Second, aluminum prints are made using dye sublimation technology, not inkjet, which itself usually affords a smoother tonality since the sublimated dye particles are effectively a higher "dpi" than ink droplets.

Not that metallic finishe paper is a bad thing at all, but don't expect the same effect as aluminum.