Practice practice practice! (annoying phrase, right? :P )
You don't want to write like them anyway, there's nothing more rewarding than developing your own voice in your work.

Case in point: Terry Pratchett will never be successfully mimicked.
(Sivvus trolley collision in the fruit aisle led to a jam, Sat 29 May 2010, 1:15, 1 reply)

It's even worse than voice
I got 40,000 words into my first serious novel before I realised I was basically writing Night Watch. Which seemed kinda superfluous, given that it had already been written. Out with the editing chainsaw!!
(Falstaff's Spiritual Successor, Sat 29 May 2010, 1:42, closed)