To get the most out of your car it's best to stay within the same tire class with very similar grip levels and wet performance. With DZ101s on the front I would probably choose from these tires:
http://www.tirerack.com/tires/surveyresults/surveydisplay.jsp?type=UHP
Putting Hankook V12s on might work fine but I expect them to have a bit more wet and dry grip resulting in a little more understeer while cornering. It will still be safe to drive but you might not enjoy running two different tires.
Here is a tire Rack test video with the V12s:
http://www.tirerack.com/tires/tires.jsp?tireMake=Hankook&tireModel=Ventus+V12+evo+K110
And here is the DZ101 tested:
http://www.tirerack.com/tires/tests/testDisplay.jsp?ttid=97