heres a version that plays better (fits 1080p screen) but has a lower bit rating...just under 4MBps

When you say Ghosting I guess you mean lens flare to reduce it you will need a lens hood or Matte Box Also when you say stabilisation stuff just use a tripod or monopod or keep a wide angle lens on the GH2 as your 50mm is really 100mm with the x2 factor. A 28mm or 35mm would be good. Do you have a OIS panasonic lens as this helps loads but most of the stock lenes are to slow for night shoots

A Photo Tripod will still be better than hand held with no OIS. A f2.8 is still alittle slow you can get canon FD lens cheap a 50mm 1.4 is around £60-70. if its better with the UV filter off you have you answer.

I think a bit of slow-motion would look nice with stuff like this. Also I love the round blurred lights (for example at 0:53). When it focusses on things I'm then disturbed by the lack of very accurate focus. But for example, a foreground object like a railing, or some steam from a drain, perfectly in focus, with blurred lights moving in the distance behind it, is a lovely subject. I'd say yes to the tripod rather than a stabilizer, because otherwise you have moving subjects (the lights) and a moving camera. A stabilizer with a moving subject will still have essentially two moving elements to it, whereas the tripod will give a sense of solidity and "class" to the whole thing. Especially with a bit of slo-mo. And if you throw in a bit of grading with different curves to each of the RGB colours, you might end up with interesting false colours in the lights, which could be a good look to experiment with if you are aiming for something abstract. Have a search for grading on this forum to see what's possible. Also could you refine it to a particular theme to give it slightly more coherence? Perhaps choose a word or two that you want to illustrate in pictures, then go out and shoot with that in mind?