Of the three sister ships only the Hobart lasted until she was scrapped.
The Sydney we all now know about and the Perth was sunk in a night action in the Sunda Strait along I think with the USS Huston. They had engaged a much larger force of Japanese ships and did considerable damage to them before being sunk.
As a youngster I can recall the Hobart on what was possibly her last visit to her port of name before being sold to the Japanese for scrap. The 8" gun cruisers were a very impressive ship for their time.