None of them... Baby steps, all the way.

Perhaps if you had included previous TOTL models to those lists, there might have been more to work with (BTW, you forgot the VA76 between the G1000 and the G70), but all of those are just incremental increases, IMO. Plus, they don't all follow the same timeline (G1000 precedes them ALL).

OK, OK, I guess if you HAVE to pick one, I'd say Yamaha. SA is a completely new technology to arrangers. SD1 had audio loops, Audya has audio loops, PA2Xpro didn't get DNC until an upgrade, and has no samples to leverage it... The timeline is longest in Roland's case, and the G70 v3 (forgot that update? ) is, IMO a FAR more significant change in overall SOUND than the others, but it took longer, so no cigar...

But using the word 'leap' is a bit of a stretch for most of these, I fear...