It takes a long time to change the image of a company once it has been established. KIA has been established as a cheap value brand and raising prices and quality will not change that perspective in the short or medium term. You won’t see people switching to them from MB, BMW, Volvo unless their circumstances have changed and can no longer afford their vehicle or choice.
It is far easier to start as a luxury brand and offer value lines and models than to start as a value and upgrade to luxury.
finally no matter how it looks a cheap brand will always struggle with quality and kia interior quality normally leaves a lot to desire.