Going back to the topic, I think that the sheer quantity of ROM does not mean anything; what matters is the "quality" of the sounds. Kurzweil succeeded in packing one of the most used digital pianos (by professional players) in just 12 Mb.
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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.