The RS7000 has the AWM2 pianos, but its voices aren't megavoices, just a single voice per track, and the vari effect is always defaulted off, and of course it don't have a pressure sensitive keybed, however it can probably come close with one of its pianos, strings, or guitars while using a wah type effect on it. Just throwing that out there, cause I compare everything to my RS.
I think the main characteristic, the funkyness, is from a wah or similar effect that can be edited independent of the main LFO and filters. Also, the CS2X and or CS6X might have something similar on them, but I'm not sure, they have AWM2s in them too with megavoice ability, but the rest of the engine might be too difrent to produce something exactly like it, but I imagine can probably come pretty close to it. Its mostly in the effects for that sound I think, which does sound like a type of wah. From what I understand, the biggest dif on that motif from the rest of the AWM2 based synths is that it looks like you can insert up to 6 effects on top of each voice/track, correct? A lot of sonic character could be comming from stacking effects, and not just the sampled waveforms or the subtractive part of its synth engine.
Good practice I think is to sample in the resonance from a source, so resonance doesn't have to be added so much as it can more easily be removed in the subtractive part of the synth's engine on them. I've often noticed the same thing on my RS, especially with the more FMy labeled voices, turning the decay up can really open up the sound. Maybe that is a Yamaha thing, and why folks tend to think Yamahas are more bland sounding, Yamaha seems to like to keep their default voice settings fairly neutral and dry, which for me invites them to be tweaked rather than spending an hour to scroll through all the voices just to find a slightly different or better one.
Also, I'm not so sure about the sample length always equating to sound quality and realism, some yamahas and I presume most if not all the motifs have the higher bit depth output D/A converters, so the AWM2 samples should sound crisper coming out on them then ones with lower bit depth output. And don't forget layering, which helps to have those megavoices.
If you are really in to piano sounds, you might also want to check out any of Yamaha's synths that can accept the PLG cards, they have one or more specifically for doing pianos.