X100 VIEWFINDER QUESTION.

I JUST PURCHASED AN X100.  I EXPECTED THE EVF IMAGE AND THE OVF IMAGE TO BE FAIRLY SIMILAR .  HOWEVER, WHEN I USE THE EVF THE IMAGE IS NOTHING LIKE THE IMAGE USING THE OVF.   AS AN EXAMPLE, BRIGHT WHITE CLOUDS AGAINST A BRIGHT BLUE SKY BECOME DULL GRAYISH CLOUDS AGAINST A DULL BLUE GRAY SKY. IS THIS A SETTING ISSUE OR A MALFUNCTION?  I HAVE BEEN USING F4 WITH ISO 200 AND A CAMERA SET SPPED OF 1/500.