How about the effect section? The Tyros has the best DSP I have ever heard in an arranger keyboard and we all know how the effects are important for the final sound.
This whole comparison reminds me of another one, between the PSR 2000 and the PSR 9000; when I played the 2000 I noticed that, even if the waveforms were the same, the single instruments sounded better (richer maybe?) in the 9000.
Guess what? The difference was in the DSP.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.