Thankfully the 1960 original is still in circulation and looks even better on dvd. It is perhaps Delon's defining role. Antonioni's L'ECLISSE and then Visconti's THE LEOPARD made him the prestige young actor, just as Romy Schneider was becoming the prestige actress of the time, as their romance wound down. He was fun and attractive too in a French comedy FAIBLES FEMMES. He also had a flirtation with Hollywood making a few inconsequential films there, before returning to France and classics like LE SAMURAI and BORSALINO with Belmondo, remaining one of France's most intriguing stars. One could write lots about his later films and scandals. There are several dvd box-sets too, worth investigating. I recently discovered Clement's 1954 KNAVE OF HEARTS (or MONSEIUR RIPOIS) with that pre-Delon charmer Gerard Philipe (reviewed here in an earlier post) - it was worth the wait.
Above: Romy Schneider in her one shot appearance at the start of PLEIN SOLEIL.
Below: Delon, Schneider, Ronet and Jane Birkin in the 1969 Deray thriller LA PISCINE. Jane looks like she is still in BLOW-UP mode.