[be] worlds apart

to be vastly different from each other in terms of opinions, attitude, etc.

Despite being siblings, their personalities were worlds apart - one was outgoing and adventurous, while the other was introverted and reserved.
The political candidates' ideologies were worlds apart, making it challenging to find common ground during the debate.
Growing up in different countries, they had completely different upbringings and cultural perspectives, making their experiences worlds apart.
The two companies' approaches to business were worlds apart - one focused on innovation and risk-taking, while the other emphasized stability and tradition.
After the divorce, their lifestyles and priorities became worlds apart, leading to a significant rift between them.