For me its a toss up between Jorge Jimenez and Kenneth Rocafort.
I love Frank Quitely in All-Star Superman, John Byrne in Man of Steel and Patrick Hleason in Rebirth.
Jose Luis Garcia Lopez.
Dan Jurgens (and several others already mentioned here).
As I have mentioned here previously, my all-time favorite Superman artist was–and always will be–Curtis Swan! He was a master craftsman and storyteller. He drew Superman for FORTY YEARS! Dedication and talent, traits lacking in the current comic book industry.
Top three: John Byrne, Dan Jurgens and Jim Lee.