Alec Guinness has made many good films - but Star wars made him immortal... and Peter Cushing's Tarkin a super "bad villain" ... but I like both of them so much... Thanks for painting Alec Guinness.
Sadly, Guinness hated this role, probably because it overshadowed his other dramatic accomplishments. He foisted as many of his Episode V & VI lines onto Yoda as he could. And despite being quite the gentleman, he usually refused to respond to Star Wars fan mail.
Conversely, Peter Cushing was Mister Sunshine in real life.