Night shot with Z1 is a breeze with F2.0 lens & SteadyShot Image Stabilizer on, here's a couple handheld. Was able to shoot 1/8s rather easily. No post process done below.
ISO100, F2.0, 1/8s, this was shot with M mode, where I control the ISO and the picture size to get the higher IQ and resolution, however, using M mode it seems the camera takes a longer time to AF. And sometimes there are misfocus shots, once nailed though it's very good.
Cropped 100% of above shot. Details retained.
ISO400, F2.0, 1/25s, this is still very useable personally. This was shot in Superior Auto mode, which defines the resolution, crop factor and ISO automatically, somehow it automate the shot to 16:9 crop.