Leading vs. Supporting Categories in 1988 …
IMO John Cleese, Jamie Lee Curtis and Kevin Kline are all leads in A Fish Called Wanda. Oscar put Kline in the supporting category which he benefited from and won. BAFTA had him as a lead.
Barbara Hershey and Jodhi May are the leads in A World Apart. Linda Mvusi is supporting.
John Malkovich and Glenn Close are the leads in Dangerous Liaisons. Michelle Pfeiffer is supporting.
Sam Neill is the lead actor in A Cry In the Dark.
Melanie Griffith is the sole lead in Working Girl.
Kevin Kostner, Tim Robbins and Susan Sarandon are all leads in Bull Burham.
Greta Scacchi and Joss Ackland are the two leads in White Mischief.
Genevieve Bujold is the lead actress in Dead Ringers.
Elizabeth Perkins is the lead actress in Big.
Bryan Brown is supporting in Gorillas In the Mist.
Johanna Ter Steege is supporting in The Vanishing.
I too have Juliette Binoche as a lead and Lena Olin as supporting in The Unbearabe Lightness of Being.