You can really see the difference the D7100's antialiasing-filter-free sensor makes for rendering more naturally sharp images. By ISO 1600, you can't do a lot with detail in the Canon's raw files, but the Nikon's still let you retain quite a bit of detail. (Nikon's default JPEG settings leave more color noise in the images than Canon's.)
The contrasty exposures produced by the default Auto Picture Style can result in too many chipped shadows. I didn't make any adjustments to the raw image here. Sorry it's crooked, but that's partly from the relatively unusable -- especially in the dark -- level in the camera's viewfinder.
By default, Canon boosts contrast and saturation just a little too much for my taste, though many folks will find the colors pleasing. You just have to watch out in low light, when the contrast boost can end up clipping more shadows than you'd like.
In good light, the video looks pretty good. Like stills, it lacks sharpness, but that's also a function of the relatively low resolution of HD. You can see some ringing (halos) on high-contrast edges, but that's pretty typical.
Edges display various artifacts, notably aliasing, which become especially distracting in out-of-focus areas (look at the edge crawl on the terrace railing in upper left) and which become more pronounced as ISO sensitivity rises. This is pretty common as well, though.