Jython long pre-exists any of the work on Truffle and Graal — the priority of the 2.7 release was just getting back to being compatible with an up-to-date Python release, and very little work was done on performance. (It's often faster than CPython for warm code, but also a lot slower than PyPy.) The majority of people who use Jython use it for interoperability with other JVM languages, rather than performance per-se.

There's also ZipPy, a Python 3 implementation based on Truffle/Graal. In some benchmarks, it far out-performs even PyPy, but it's very much incomplete so it's hard to make general conclusions as many (most?) larger benchmarks don't run.