Paul McCartney and John Lennon held a great deal of respect for one another. This didn't extend to everyone else who worked with The Beatles.
Paul McCartney and John Lennon worked closely together for years. While they had two other bandmates, multiple sound engineers, a manager, and a producer to assist them, they primarily relied on one another. While producer George Martin had a say over how their albums sounded, they reportedly never treated him with the same respect they showed one another. According to a Beatles audio engineer.
In the early 1960s, Lennon and McCartney had a close working relationship. As the decade wore on, they wrote songs separately, but they were one another’s primary ally for years.
“During playbacks, John and Paul would often huddle together and discuss whether a take was good enough; they’d talk about what they were hearing and what they wanted to fix or do differently,” engineer Geoff Emerick recalled in his book Here, There and Everywhere: My Life Recording the Music of the Beatles. “John wasn’t casual about making records, not in the early years, anyway. Still, it was Paul who was always striving to get things the best that they could possibly be.”
Source: Emma McKee/cheatsheet.com