The f stop on that camera is f/2 - f/4.5. I would consider that to be okay. If it started at f/4.5 I would say no way. f/2 is pretty good.
I like to keep the lens open to f2.8 (or greater. For the f stop, lower is better).
The more you zoom the smaller the aperture so when you're really zoomed in, you will probably get some blurring (because you'll be at f/4.5), unless it's a really well lit stage. Ideally you would be close to the stage.
So, in ideal situations this will work.
IMO the best point and shot for the concert goer is the Canon S90 ($350 new). And even then I wouldn't expect professional results all the time.
Also, you don't want to use a flash at shows unless you are a few feet from the stage (and that's not nice to do to the performer). That little flash will only light up the heads of people in front of you.
I do really like the Panasonic cameras. They are right up there with Canon and Nikon. Certainly the best cameras from the non-camera companies.
If I had to guess I would think it would be either the same or just slightly better than your Nikon (since you didn't mention a model, I can't tell you for sure)
Oh, the sensor also has something to do with it, so you can't expect all camera that open to f/2 to perform the same.
With the liberal return policy you might want to give it a try.