Original Rega Planet vs. new Jupiter

I'm really an analog guy but 2 years ago I added to my secondary system a used Rega Planet, the original, to start a cd collection. I have been thinking about upgrading by purchasing used a 2000 version Rega Jupiter.. can any of you experienced with the sound of these two tell me if it's worth the upgrade and what the differences are or improvements the jupiter makes over the planet, if any and how noticable? thank you for any help.