To think you can judge a CS-80 on the presets and sonic qualities of the arturia is well, not a good thought. The CS-80 is incredible sounding, and much of the tonal quality and charm of the 80 is just what you mentioned, the stacking of layers that you can do. That being said, the 50 and 60 are incredible synths. They sound great and are quite unique in their own right. The ring modulator is classic.
For what it's worth, I have an entire album (35 minutes) of CS-80 music here: Bartesho
It is entirely done as one track, live. Only reverb was added.