I always thought Chaves Sr had incredible footwork, Roberto Duran, Lomachenko, Chocolatito. If you watch any fight really you can learn something about footwork, from the mistakes too.
Past: Ricardo 'Finito' López Nava, 'Sugar' Ray Leonard. Nowdays: Vasil Lomachenko, Miguel Ángel García, Juan 'Churritos' Hernández, Jorge Linares, Francisco 'El Gallo' Estrada.