Obviously very far, if you refer to synth workstations:

In the specs I see: "Parts: left / right 1, right 2, right 3"

As I said, in a synth workstation you have 16 parts you can all use live and assign to any range on the keyboard. Having only one part for the left half of the keyboard is a no go for many.

Then I don't know whether you can access several elements within a voice and change them - I guess you can't, at least not onboard.