Hello,
I owned the Saturn and now the Cambridge 840c.
I owned them both at the same time, and did extensive comparisons.
They are VERY CLOSE to be honest.
The Saturn has a slightly warmer, slightly more laid back sound. It also has a slightly blacker background and a slightly wider soundstage.
But, I personally prefer the 840c to be honest.
It has a touch more forward sound, and sounds alittle better on vocals. The Saturn seems to "sugar coat" voices to a certain extent. Dynamics and bass are very comparable and so is top-end extension. They both provide excellent body to instruments and both have a spacious soundstage.
Neither is harsh, bright, or sibilant by any stretch of the imagination.
The Cambridge does have true balanced XLR outputs and the Saturn does not. I also prefer the front loading of the 840c to the top loading Saturn.
You really cannot go wrong with either player.
They both require a minimum of 200 hours of break-in to sound their best.
Ask yourself this: Do I prefer a slightly warmer, richer, more laid back perspective, or do I prefer a slightly more forward, slightly cooler presentation with slightly better vocal presentation and vocal clarity?
This should answer your question on which player to get.
They are virtually in the same class, IMHO.
Hope this helps.