The Alexa Classic isn't called "Classic" for nothing. This camera has proved itself as a great camera and has the same sensor as the Alexa Mini and Amira.

The Classic can only fit a PL mount, has no built-in NDs and only shoots in 2K and HD up to 120fps. If this suffices and you want the same image quality, then this camera is the perfect choice. If you need better specifications, the Alexa Mini or Amira might be more suitable for you.