Well, a lot of the sound you will get will depend on the strings you decide to put on the GK Pro.
I've got the GK Pro with Rosewood sides and back.
If you plan on plugging it in, you could dial in any sound...
The GK models with cypress sides and back will not give you the classical sound that you are asking about.
I've had mine for about 4 years now. It's not quite the warm classical sound as a standard classical guitar, but it's very close. It's extremely versatile and I can play a number of different genre's on it.. Finger style jazz is awesome on it.
The inherent design of the GK (Gypsy King) can give it a bit of a flamenco sound to it. But if you tweak the neck relief and string height a little bit, it's as close to classical as you can get.
Some folks will tell that any nylon string guitar with a cutaway isn't "classical".