He is leading a rich, luxurious life.
He leads a wealthy lifestyle.
This hotel has a very luxurious atmosphere.
Used for food and drink with a deep, satisfying flavor. Common in descriptions of desserts, sauces, and coffee.
This chocolate cake has a rich flavor.
I want to drink a rich, full-bodied coffee.
This chocolate has a rich flavor.
She became rich through investing.
Adding butter gives it a rich flavor.
金持ち is a plain, everyday noun for a wealthy person, whereas リッチ is a na-adjective used to describe things or lifestyles as luxurious.
リーチ (reach) and リッチ (rich, wealthy) sound similar but are unrelated loanwords with completely different meanings.
Loanword from English 'rich', used in Japanese since the 20th century.