I think you are right on the money Bachus in your review . Sound wise I think the yamaha tyros 5 is simply the best sounding keyboard on the market bar non including workstations . But they have deliberately limited the flexibility and features on the Tyros range so that it does not eat too much into their workstation market.

However Korg have for a long time now wrestled with the quality of the internal sounds. However well those sounds can be tweaked and edited you still have to work from the basic samples which in my view have not changed in the korg range for the last 10 years . Yamaha sounds so good because of the detail and the number of samples that are used in their S A technology which is huge. So Yamaha have the ability to build on this vast library of individual detailed samples to extend the S A range further and further.

In my view until Korg invest in an upgraded sample sound set and the level of detail comparable with Yamaha, they will always be behind in terms of sound quality. The korg sounds really impressive but the Yamaha sound is outstanding