The Salvator Mundi definitely seems inferior. There's something very unnatural about the right hand. I can't get my hand in that position and I'm not disabled. The glass orb in the left hand doesn't seem to refract any light at all—I can't imagine as scientifically minded of a painter as Leonardo settling for this. And the eyes...it just has this derpy look

Matthew Landrus and other art historians argue it came from Leonardo's workshop and Leonardo may have contributed some of the brush strokes—I have no problem believing that. But I just don't see this as a Leonardo