Similarities
Both men have been relatively quiet about their work; Robert Pattinson mostly keeps to himself and his friends and family, while Robert Downey Jr. is always willing to speak about his work. However, when they do talk about their movies, they often talk about a similar array of films. Both men have worked with the same producers, and have acted in several of the same films. In some ways, they are similar, but there are also clear differences.
Differences
While Robert Pattinson has kept a relatively low profile in the public eye, he has been very active on the red carpet. He has modeled for fashion brands and has also been part of major promotional activity for his movies. When it comes to his movies, he almost always has a hand in the story and screenplay, as well as playing a significant role in the production. Robert Downey Jr. has been very open about his life, his career, and his opinions. It is generally well-known and well-liked that he is one of the most important actors of his generation. He has had several major hits and has worked with some of the biggest names in Hollywood. As well as being a major movie star, he also created or co-created several TV shows, including the iconic Ironman series.
When it comes to their personal lives, the two men are very different. Robert Pattinson dated several high-profile women before he finally married his longtime girlfriend, Stedman Graham, in 2017. He has been open about his wife and kids, who he often mentions in interviews. In 2018, he even revealed that he is a father again after only having one child with Graham. He is equally as open about his drug use, often showing off his tattoos as a way of expressing his art and his philosophy of self-expression. When it comes to tattoos, Robert Pattinson usually has a design on his body that represents some kind of concept or idea. He has a large bear on his chest that is a tribute to his hometown of London, along with a number of smaller designs on his arms that reference various styles of art and music.
Robert Downey Jr. has been married to Mariana Grisanti since 1998. The couple have a daughter named Charlotte and a son named Sam. They have been together since high school and were both model students growing up. While Robert Downey Jr. has talked about his private life and family in interviews, he rarely talks about his career. When he does, he often focuses on his kids and how proud he is of them.