My D800 became my wildlife camera as well as for landscapes. I bought the D800 principally for a dual role in the absence of the long awaited D400. However, the D7100 does almost everything I'd hoped for in a D400, so that wish list is now shredded and my D800 is now landscape only.
Interestingly, my D7100 has become an occasional landscape camera when traveling light and does that extremely well too. I am an extremely happy guy with two cameras that do what they do so very, very well