Some great comics:
Hugo Pratt - Corto Maltese (and other stuff of him)
Daniel Clowes - Like a Velvet Glove Cast in Iron
Moebius - Le garage hermetique
Gilbert and Jaime Hernandez - Love and Rockets
Dave Sim - Cerebus
Alan Moore - (nearly everything he ever did)
Frank Miller - Elektra Assassin
Ronin
Vittorio Giardino - Max Friedmann
Jacques Loustal
Charles Burns - Black Hole
David Lapham - Stray Bullets
Mathias Schultheis - Die Wahrheit über Shelby
Guido Crepax
Neil Gaiman - Sandman
and there will be more if I think about it a few min longer …
And Comanche by Hermann and Greg is an excellent Western which probably tops every US Western comic.