Cue D800 discussion/arguments/flames/trolls. Oh, wait, this isn't CR.

The issue actually is related to DR - the shot of your fiancé is pretty low DR, whereas a landscape scene often has a very high scene DR. If you expose to capture the details on the ground, the sky is 'blown out', and if you expose to preserve the highlights in the sky, the ground is too dark.

You might consider trying exposure blending (an HDR-like approach, often lumped together because the same software usually does both). Basically, you're taking multiple exposures, and the software blends them so you see detail in the shadows and in the highlights.

The hardware option is a graduated neutral density filter, which is dark on top and clear on the bottom, so a single exposure effectively captures shadow and highlights, by selectively darkening the highlights. Have a read in this thread: http://community.the-digital-picture...ead.php?t=6725