Really depends on what I'm doing...
When I'm shooting professionally my D800 and My K3 are always on me. Depending on the event will depend on which camera is primary. The primary camera will be fitted with either the 24-70 or 70-200 equivilent zoom while the secondary camera will have a prime on it. Usually this is 70-200 f2.8 VRII on the Nikon and FA 77mm f1.8 on the Pentax...because well... Pixie Dust. (or DA*50-135 f2.8 and Nikon 135mm f2.0 because... Pixie dust)
I've also decided at my last fashion shoot I did this summer to go LX and K3. Yea, you heard me, film and digital for a paid fashion shoot. The film images were arguably better....
Urban exploring? Depends on what my goal is, if I'm doing ultra wide stuff Nikon D800 with 16-35 Tokina f4 and my Pentax LX with the FA 31 and 43 in my pocket.
Chances are I usually have at least two cameras with me unless it's a family event or I'm practicing a certain tecnique, and almost always that second camera is film and either my LX or my 645.