"a far cry from" is an expression that is used to describe something that is very different from something else. For example: "These clothes are very expensive, they are a far cry from my old clothes" "This meal is delicious, it is a far cry from my cooking at home" "His exam results were very good, they were a far cry from the results he was predicted"

Their new job is very different to their previous one.

I agree with Jennifer, with an additional element: it's very different from (and not nearly as good as), in this example - probably!