All those gimmicks are mute points in an RPG, unless the story excels. You say "story is better", but you have yet to complete the story thus far. Great logic there.
At best K2 provides a medicore story which fails to flow coherently, and wanes notably towards it's conclusion. That doesn't constitute a better story for me. That doesn't constitute a better RPG for me.
That being said K2 is still an excellent game relatively speaking. As someone previously mentioned, "Better looking jedi robes, prestige classes, the use of skills, the workbench, darker atmosphere", are bound to be appreciated by fans alike.
But at the end of the day, where K1 left you satisfied with a feeling of accomplishment, K2 it left wanting in it's broken ambiguity.