Gunnar, it's not simply a question of the sound quality that makes for the price difference. T2 has more sounds, effects, a sampler, more parts, aftertouch, and many many other things that can justify a price difference. We are simply talking about ONE issue... is there a noticeable tone QUALITY difference between the two?

They have many sounds in common, it would be interesting to find out, when playing IDENTICAL patches (at least by name!), through the same EQ and effects settings (or even better would be to turn those off for a more naked look at tone quality) whether they are discernibly different. After all, many of us can do without a sampler, aftertouch, more keyboard Parts and many of the other things that distinguish the Tyros line. If even ONLY the sound quality is the same, an S910 might be a VERY affordable alternative to a $4k T3