As with any of these things, the skill of the player is the REAL determining factor in how real something sounds. Play the world's best violin sound in a way a violinist wouldn't, you just undid all the work of the people who made the samples and the patch...
Seems he plays the violin like its a key instument,,, .. not using DNC on the Korg, which gives it a disadvantege to the SA2....
But in general
If you compare the seperate sounds with each other, some go to Yamaha, some victories go to Korg..
I would say Piano, E piano and B3 and violin are still victories for Korg. Saxaphones, guitars, strings, churchorgan(by ten miles) goes to Yamaha
Styles are a tie, i would say.
The difference is more about personall preferences in sound then about actuall sample and styles quallity because the quallity comes pretty close.
To me this proves what the T5 sound much more cleaner and live then the T4 and moved in sound quallity very close to the PA3X.