http://www.nikonchat.com/nikon-d5100-picture-quality/

Nikon D5100, Nikon D90 or Canon EOS 600d which one to buy?
that one has the best image quality in low light
I would suggest Nikon d90 camera of all the previous option.The D90 camera is solid, firm and well balanced with the 18-105 VR lens.It 's always ready and shoot very fast. I love all the shortcut buttons, are easy to press, touch sensor feedback.its good to excellent terrain feature set, can actually help improve his technique and get better results. ***
Nikon D5100 review